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 A218393 E.g.f. A(x) satisfies: Sum_{n>=0} 3^(n^2-n) * x^n/n! / A(3^n*x) = 1. 1
 1, 1, 5, 429, 399273, 3072726201, 195746363156205, 107315772169710355749, 519518439242514267271247313, 22466597296811866577087885119239921, 8719095388372045822565716229498060925301845, 30421189091577923093547933001708849981738642279605789 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS EXAMPLE E.g.f.: A(x) = 1 + x + 5*x^2/2! + 429*x^3/3! + 399273*x^4/4! + 3072726201*x^5/5! +... where 1 = 1/A(x) + x/A(3*x) + 3^2*x^2/2!/A(3^2*x) + 3^6*x^3/3!/A(3^3*x) + 3^12*x^4/4!/A(3^4*x) + 3^20*x^5/5!/A(3^5*x) + 3^30*x^6/6!/A(3^6*x) +.... PROG (PARI) {a(n)=local(A=1+sum(k=1, n-1, a(k)*x^k/k!)+x*O(x^n)); n!*polcoeff(sum(k=0, n, 3^(k^2-k)*x^k/k!/subst(A, x, 3^k*x)), n)} for(n=0, 15, print1(a(n), ", ")) CROSSREFS Cf. A054948. Sequence in context: A217939 A147684 A199090 * A038003 A054332 A145247 Adjacent sequences:  A218390 A218391 A218392 * A218394 A218395 A218396 KEYWORD nonn AUTHOR Paul D. Hanna, Oct 27 2012 STATUS approved

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Last modified August 16 00:08 EDT 2022. Contains 356150 sequences. (Running on oeis4.)