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 A171779 E.g.f.: A(x) = 1 + Sum_{n>=1} (1/n!)*Product_{k=1..n} -log(1 - k(k+1)x/2). 1
 1, 1, 4, 38, 693, 21294, 1011792, 69920766, 6710698740, 862907887944, 144436271624388, 30735209866458888, 8152133649148990080, 2650418681465362135392, 1041182371767985227729504 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS EXAMPLE E.g.f.: A(x) = 1 + x + 4x^2/2! + 38x^3/3! + 693x^4/4! + 21294x^5/5! +... A(x) = 1 - log(1-x) + log(1-x)*log(1-3x)/2! - log(1-x)*log(1-3x)*log(1-6x)/3! +... PROG (PARI) {a(n)=n!*polcoeff(1+sum(j=1, n, (1/j!)*prod(k=1, j, -log(1-k*(k+1)/2*x +x*O(x^n)))), n)} CROSSREFS Cf. A135751, A171778. Sequence in context: A138562 A177382 A201861 * A171203 A096332 A084284 Adjacent sequences:  A171776 A171777 A171778 * A171780 A171781 A171782 KEYWORD nonn AUTHOR Paul D. Hanna, Dec 18 2009 STATUS approved

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Last modified April 18 22:08 EDT 2019. Contains 322237 sequences. (Running on oeis4.)