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Search: id:A156361
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| A156361 |
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a(2n+2)=7*a(2n+1), a(2n+1)=7*a(2n)-6^n*A000108(n), a(0)=1. |
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+0
6
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| 1, 6, 42, 288, 2016, 14040, 98280, 686880, 4808160, 33638976, 235472832, 1647983232, 11535882624, 80745019776, 565215138432, 3956385876480, 27694701135360, 193860506096640, 1357023542676480, 9499115800977408
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Hankel transform is 6^C(n+1,2).
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FORMULA
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a(n)=sum{k=0..n, A120730(n,k)*6^k}.
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CROSSREFS
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Cf. A000108, A156128, A001405, A151281, A151162, A151254, A156195
Sequence in context: A157335 A057089 A110711 this_sequence A055272 A155196 A147838
Adjacent sequences: A156358 A156359 A156360 this_sequence A156362 A156363 A156364
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KEYWORD
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nonn
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AUTHOR
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Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Feb 08 2009
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