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A168405 E.g.f.: Sum_{n>=0} arcsin(2^n*x)^n/n!. 2
1, 2, 16, 520, 66560, 33882400, 69055283200, 564153087455360, 18462510039810703360, 2418626471936038215754240, 1267795676362601991645220044800, 2658560574070850656450883768752998400 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..11.

FORMULA

a(n) = [x^n/n!] exp(2^n*arcsin(x)) for n >= 0.

EXAMPLE

E.g.f.: A(x) = 1 + 2*x + 16*x^2/2! + 520*x^3/3! + 66560*x^4/4! + ...

A(x) = 1 + arcsin(2*x) + arcsin(4*x)^2/2! + arcsin(8*x)^3/3! + arcsin(16*x)^4/4! + ... + arcsin(2^n*x)^n/n! + ...

a(n) = coefficient of x^n/n! in G(x)^(2^n) where G(x) = exp(arcsin(x)):

G(x) = 1 + x + x^2/2! + 2*x^3/3! + 5*x^4/4! + 20*x^5/5! + 85*x^6/6! + ... + A006228(n)*x^n/n! + ...

PROG

(PARI) {a(n)=n!*polcoeff(sum(k=0, n, asin(2^k*x +x*O(x^n))^k/k!), n)}

(PARI) {a(n)=n!*polcoeff(exp(2^n*asin(x +x*O(x^n))), n)}

CROSSREFS

Cf. A006228 (exp(arcsin x)), variants: A136632, A168402, A168403, A168404, A168406, A168407, A168408.

Sequence in context: A002416 A013028 A136632 * A012919 A012914 A168404

Adjacent sequences:  A168402 A168403 A168404 * A168406 A168407 A168408

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Nov 25 2009

STATUS

approved

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Last modified May 17 12:38 EDT 2022. Contains 353746 sequences. (Running on oeis4.)