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A012778 Expansion of e.g.f. sec(sec(x)*log(x+1)). 1
1, 0, 1, -3, 28, -160, 1630, -14700, 180668, -2227608, 32850740, -507842060, 8829277928, -162974579040, 3280768459280, -70166399557800, 1609085392223312, -39068177212368192, 1006531896581760976 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Robert Israel, Table of n, a(n) for n = 0..299

EXAMPLE

1 + (1/2!)*x^2 - (3/3!)*x^3 + (28/4!)*x^4 - (160/5!)*x^5 + ...

MAPLE

N:= 300: # number of terms desired

S:= series(sec(sec(x)*log(x+1)), x, N):

seq(coeff(S, x, j)*j!, j=0 .. N-1);

# Robert Israel, Feb 17 2013

CROSSREFS

Sequence in context: A145346 A184440 A012762 * A302522 A303405 A074922

Adjacent sequences:  A012775 A012776 A012777 * A012779 A012780 A012781

KEYWORD

sign

AUTHOR

Patrick Demichel (patrick.demichel(AT)hp.com)

STATUS

approved

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Last modified January 18 10:33 EST 2022. Contains 350454 sequences. (Running on oeis4.)