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 A108991 Main diagonal of triangle A108990, in which the g.f. of row n, R_n(x), satisfies: [x^k] R_{n+1}(x) = [x^k] (1 + x*R_n(x))^(n+1) for k=0..n+1. 6
 1, 1, 3, 22, 287, 5496, 139727, 4447234, 170501039, 7661336692, 395314147319, 23054541596934, 1500572569678932, 107886158725753318, 8494969789519239340, 727287072573544716489, 67284371697225428990319 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Table of n, a(n) for n=0..16. PROG (PARI) {a(n)=local(F=1+x*O(x^n)); for(m=1, n, F=(1+x*F)^m); polcoeff(F, n)} CROSSREFS Cf. A108990, A108992, A108993, A108994, A108995, A108996. Sequence in context: A206801 A135862 A122778 * A247659 A244468 A325295 Adjacent sequences: A108988 A108989 A108990 * A108992 A108993 A108994 KEYWORD nonn AUTHOR Paul D. Hanna, Jun 15 2005 STATUS approved

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Last modified September 30 03:10 EDT 2023. Contains 365781 sequences. (Running on oeis4.)