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A147560 a(n) = 4*A046162(n+1). 2
0, 4, 16, 12, 64, 100, 48, 196, 256, 108, 400, 484, 192, 676, 784, 300, 1024, 1156, 432, 1444, 1600, 588, 1936, 2116, 768, 2500, 2704, 972, 3136, 3364, 1200, 3844, 4096, 1452, 4624, 4900, 1728, 5476, 5776, 2028, 6400, 6724, 2352, 7396, 7744, 2700, 8464 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..46.

FORMULA

a(n) = 4*numerator(n^2/(n^2 + 3*n + 3)).

MAPLE

A046162 := proc(n) (n-1)^2/(n^2+n+1) ; numer(%) ; end proc: A147560 := proc(n) 4*A046162(n+1) ; end proc: seq(A147560(n), n=0..70) ; # R. J. Mathar, Dec 15 2009

CROSSREFS

Companion to A144437.

Cf. A171522. [R. J. Mathar, Dec 15 2009]

Sequence in context: A223987 A224123 A273579 * A266973 A029659 A265218

Adjacent sequences:  A147557 A147558 A147559 * A147561 A147562 A147563

KEYWORD

nonn

AUTHOR

Paul Curtz, Nov 07 2008

EXTENSIONS

More terms from R. J. Mathar, Dec 15 2009

STATUS

approved

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Last modified May 19 18:35 EDT 2022. Contains 353847 sequences. (Running on oeis4.)