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A117338 Row sums of triangle A117335. 4
1, 2, 1, 4, -9, 62, -399, 3048, -26045, 247298, -2582027, 29416876, -363327081, 4837734374, -69105690039, 1054490587824, -17122237729589, 294828907099274, -5366869867749347, 102988994579465716, -2078107926978317889, 43988545301378533742 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..21.

FORMULA

G.f.: A(x) = 1/(1-x)/[Sum_{n>=0} (-1)^n*n!*x^n].

EXAMPLE

A(x) = 1 + 2*x + x^2 + 4*x^3 - 9*x^4 + 62*x^5 - 399*x^6 +-...

= 1/(1-x)/(1 - x + 2*x^2 - 6*x^3 + 24*x^4 - 120*x^5 +-...)

PROG

(PARI) a(n)=polcoeff(1/((1-x)*sum(k=0, n, (-1)^k*k!*x^k)+x*O(x^n)), n)

CROSSREFS

Cf. A117335 (triangle), A117336 (column 1), A117337 (column 2).

Sequence in context: A343398 A097949 A268572 * A279927 A137634 A100229

Adjacent sequences:  A117335 A117336 A117337 * A117339 A117340 A117341

KEYWORD

sign

AUTHOR

Paul D. Hanna, Mar 09 2006

STATUS

approved

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Last modified May 6 16:20 EDT 2021. Contains 343586 sequences. (Running on oeis4.)