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A053141
Define a(1)=0, a(2)=2 then a(n)=a(n-2)+2*sqrt(8*(a(n-1)^2)+8*a(n-1)+1).
+0
21
0, 2, 14, 84, 492, 2870, 16730, 97512, 568344, 3312554, 19306982, 112529340, 655869060, 3822685022, 22280241074, 129858761424, 756872327472, 4411375203410, 25711378892990, 149856898154532, 873430010034204
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Maintained by
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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.
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