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A089603 G.f.: sqrt(1/agm(1, 1-8*x)) = sqrt(o.g.f. for A081085). 4
1, 2, 8, 40, 226, 1380, 8880, 59280, 406416, 2842400, 20186752, 145119616, 1053575336, 7711639760, 56834201280, 421327859520, 3139306406850, 23494847031300, 176526280319120, 1330929290036560, 10065855468854980, 76341682531733960, 580460500453098080 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Seiichi Manyama, Table of n, a(n) for n = 0..500

Eric Weisstein's World of Mathematics, Arithmetic-geometric mean

Wikipedia, Arithmetic-geometric mean

PROG

(PARI) Vec( 1/agm(1, 1-8*x+O(x^66))^(1/2) ) \\ Joerg Arndt, Aug 14 2013

CROSSREFS

Cf. A081085, A089602.

Sequence in context: A177408 A289431 A085485 * A209358 A116456 A305406

Adjacent sequences:  A089600 A089601 A089602 * A089604 A089605 A089606

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Dec 31 2003

STATUS

approved

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Last modified July 22 16:43 EDT 2019. Contains 325225 sequences. (Running on oeis4.)