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A261420 Numerators of coefficients in Taylor series expansion of sqrt( 1 + Sum_{k>=1} (k*(k+1)/2)*x^k ). 1
1, 1, 11, 37, 371, 735, 2463, 4397, 91075, 280123, 1437381, 2529811, 8602103, -3127477, 52126151, 605095485, 34771603043, 53033530323, -118339970967, -925189527433, -4874069151427, 19698401278369, 210735914741353, 332611270169019, -5351278899565017, -36333411498508817 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
LINKS
EXAMPLE
The coefficients are 1, 1/2, 11/8, 37/16, 371/128, 735/256, 2463/1024, 4397/2048, 91075/32768, 280123/65536, 1437381/262144, 2529811/524288, 8602103/4194304, -3127477/8388608, 52126151/33554432, 605095485/67108864, 34771603043/2147483648, ... [corrected by Ilya Gutkovskiy, Aug 03 2023]
CROSSREFS
The denominators appear to be A046161.
Sequence in context: A147556 A201312 A120833 * A034969 A052432 A104269
KEYWORD
sign,frac
AUTHOR
N. J. A. Sloane, Aug 27 2015
STATUS
approved

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Last modified March 29 06:57 EDT 2024. Contains 371265 sequences. (Running on oeis4.)