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Search: id:A121413
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| A121413 |
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Column 1 of triangle A121412, in which row n of T equals row (n-1) of T^(n+1) with an appended '1'. |
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+0
11
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| 1, 1, 4, 30, 335, 4984, 92652, 2065146, 53636520, 1589752230, 52926799310, 1954793723688, 79297921097850, 3504206787532290, 167533486104374420, 8615231103973721610, 474145710046504872894, 27806642356199323970739
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OFFSET
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0,3
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COMMENT
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Also equals column 3 of triangle A101479.
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PROGRAM
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(PARI) {a(n)=local(A=Mat(1), B); for(m=1, n+2, B=matrix(m, m); for(i=1, m, for(j=1, i, if(j==i, B[i, j]=1, B[i, j]=(A^i)[i-1, j]); )); A=B); return((A^1)[n+2, 2])}
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CROSSREFS
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Cf. A121412 (triangle); other columns: A101483, A121414, A121415; A101479 (triangle).
Sequence in context: A139086 A128329 A006149 this_sequence A001761 A099712 A052316
Adjacent sequences: A121410 A121411 A121412 this_sequence A121414 A121415 A121416
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KEYWORD
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nonn
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), Aug 22 2006
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