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 A279435 Denominators of coefficients in expansion of 1/(1 + e^x - e^(2x)). 2
 1, 1, 2, 6, 24, 120, 144, 5040, 40320, 362880, 725760, 39916800, 479001600, 6227020800, 17435658240, 1307674368000, 20922789888000, 355687428096000, 1280474741145600, 850665037824000, 221172909834240000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Clark Kimberling, Table of n, a(n) for n = 0..1000 EXAMPLE (1/1) + (1/1)x + (5/2)x^2 + (31/6)x^3 + ... ; 1/1, 1/1, 5/2, 31/6, ... = A279434/A279435. MATHEMATICA z = 20; t = CoefficientList[Series[1/(1 + E^x - E^(2 x)), {x, 0, z}], x] Numerator[t] (* A279434 *) Denominator[t] (* A279435 *) CROSSREFS Cf. A279434. Sequence in context: A319206 A190393 A263709 * A263699 A083267 A130480 Adjacent sequences: A279432 A279433 A279434 * A279436 A279437 A279438 KEYWORD nonn,easy,frac AUTHOR Clark Kimberling, Dec 12 2016 STATUS approved

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Last modified December 1 08:52 EST 2023. Contains 367469 sequences. (Running on oeis4.)