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A032109
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"BIJ" (reversible, indistinct, labeled) transform of 1,1,1,1...
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1
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1, 1, 2, 7, 38, 271, 2342, 23647, 272918, 3543631, 51123782, 811316287, 14045783798, 263429174191, 5320671485222, 115141595488927, 2657827340990678, 65185383514567951, 1692767331628422662
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| Starting (1, 2, 7, 38, 271,...) = A008292 * [1, 1, 2, 4, 8,...] [From Gary W. Adamson (qntmpkt(AT)yahoo.com), Dec 25 2008]
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LINKS
| C. G. Bower, Transforms (2)
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FORMULA
| E.g.f.: (e^(2*x)-2*e^x-1)/(2*e^x-4).
a(n) = (A000670(n)+1)/2. - Vladeta Jovovic (vladeta(AT)eunet.rs), Apr 13 2003
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PROG
| (PARI) a(n)=if(n<0, 0, n!*polcoeff(subst((1-y^2/2)/(1-y), y, exp(x+x*O(x^n))-1), n))
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CROSSREFS
| A052856(n)=2*a(n), if n>0.
A008292 [From Gary W. Adamson (qntmpkt(AT)yahoo.com), Dec 25 2008]
Sequence in context: A036432 A094431 A168492 * A088792 A114160 A145159
Adjacent sequences: A032106 A032107 A032108 * A032110 A032111 A032112
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KEYWORD
| nonn
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AUTHOR
| Christian G. Bower (bowerc(AT)usa.net)
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