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Search: id:A131785
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A131785 a(n) = A131770( n*(n+1)/2 ) for n>=0. +0
2
1, 2, 8, 32, 156, 820, 4744, 29544, 196708, 1388012, 10320096, 80474620, 655800496, 5569011668, 49164525468, 450312766892, 4271622415228, 41898174547952, 424319014633656, 4431086950025056, 47656288619258248, 527272509796024344 (list; graph; listen)
OFFSET

0,2
CROSSREFS

Cf. A131770, A131771, A131786.

Sequence in context: A003304 A150864 A054116 this_sequence A006669 A030804 A030895

Adjacent sequences: A131782 A131783 A131784 this_sequence A131786 A131787 A131788

KEYWORD

nonn

AUTHOR

Paul D. Hanna (pauldhanna(AT)juno.com), Jul 15 2007

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Last modified December 3 01:16 EST 2008. Contains 151161 sequences.

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