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A193473
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Denominator of ez(n-1)*n!/(4^n-2^n) where ez(n) is the n-th coefficient of sec(t)+tan(t) for n>0, a(0) = 1.
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2
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1, 2, 6, 56, 30, 992, 42, 16256, 30, 261632, 66, 4192256, 2730, 67100672, 6, 1073709056, 510, 17179738112, 798, 274877382656, 330, 628292059136, 138, 70368735789056, 2730, 1125899873288192, 6, 18014398375264256, 870
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OFFSET
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0,2
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LINKS
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Table of n, a(n) for n=0..28.
Peter Luschny, The lost Bernoulli numbers.
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MAPLE
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gf := (f, n) -> coeff(series(f(x), x, n+1), x, n):
BG := n ->`if`(n=0, 1, gf(sec+tan, n-1)*n!/(4^n-2^n)):
A193473 := n -> denom(BG(n)): seq(A193473(n), n=0..28);
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CROSSREFS
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Cf. A000367, A002445, A009843, A193475, A193472.
Sequence in context: A153450 A179389 A084123 * A181509 A213026 A074023
Adjacent sequences: A193470 A193471 A193472 * A193474 A193475 A193476
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KEYWORD
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nonn,frac
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AUTHOR
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Peter Luschny, Aug 07 2011
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STATUS
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approved
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