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Search: id:A025264
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A025264 a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ...+ a(n-1)*a(1) for n >= 4. +0
2
2, 1, 1, 5, 22, 99, 450, 2067, 9586, 44852, 211570, 1005427, 4810460, 23157904, 112110906, 545524287, 2666864340, 13092764136, 64527778938, 319157531592, 1583724160896, 7882364163954, 39339994155288, 196843821874407, 987272738842392 (list; graph; listen)
OFFSET

1,1
FORMULA

G.f.: (1-sqrt(1-8*x+12*x^2+12*x^3))/2 - Michael Somos, Jun 08, 2000.

PROGRAM

(PARI) a(n)=polcoeff((1-sqrt(1-8*x+12*x^2+12*x^3+x*O(x^n)))/2, n)

CROSSREFS

Cf. A025266.

Sequence in context: A049252 A098315 A036563 this_sequence A139622 A152656 A096162

Adjacent sequences: A025261 A025262 A025263 this_sequence A025265 A025266 A025267

KEYWORD

nonn

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu)

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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