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Search: id:A132373
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| A132373 |
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Expansion of c(6*x^2)/(1-x*c(6*x^2)), where c(x) is the g.f. of A000108. |
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+0
2
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| 1, 1, 7, 13, 91, 205, 1435, 3565, 24955, 65821, 460747, 1265677, 8859739, 25066621, 175466347, 507709165, 3553964155, 10466643805, 73266506635, 218878998733, 1532152991131, 4631531585341, 32420721097387, 98980721277613, 692865048943291, 2133274258946845
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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Hankel transform is 6^C(n+1,2) . Series reversion of (1+x)/(1+2x+7x^2).
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FORMULA
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a(n) = Sum_{k, 0<=k<=n}A120730(n,k)*6^(n-k).
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CROSSREFS
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Cf. A000012, A001405, A126087, A128386, A121724, A128387.
Adjacent sequences: A132370 A132371 A132372 this_sequence A132374 A132375 A132376
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KEYWORD
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easy,nonn,new
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AUTHOR
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Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Nov 10 2007
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EXTENSIONS
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Corrected series reversion formula. Added terms beyond a(7) - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 19 2009
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