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A010013
a(0) = 1, a(n) = 23*n^2 + 2 for n>0.
1
1, 25, 94, 209, 370, 577, 830, 1129, 1474, 1865, 2302, 2785, 3314, 3889, 4510, 5177, 5890, 6649, 7454, 8305, 9202, 10145, 11134, 12169, 13250, 14377, 15550, 16769, 18034, 19345, 20702, 22105, 23554, 25049, 26590, 28177, 29810, 31489, 33214, 34985, 36802, 38665
OFFSET
0,2
FORMULA
G.f.: (1+x)*(1+21*x+x^2)/(1-x)^3. - Bruno Berselli, Feb 06 2012
E.g.f.: (x*(x+1)*23+2)*e^x-1. - Gopinath A. R., Feb 14 2012
Sum_{n>=0} 1/a(n) = 3/4 + sqrt(46)/92*Pi*coth( Pi*sqrt(46)/23) = 1.0677349581... - R. J. Mathar, May 07 2024
a(n) = A069174(n)+A069174(n+1). - R. J. Mathar, May 07 2024
MATHEMATICA
Join[{1}, 23 Range[41]^2 + 2] (* Bruno Berselli, Feb 06 2012 *)
CROSSREFS
Cf. A206399.
Sequence in context: A262492 A280297 A090659 * A256716 A063769 A099771
KEYWORD
nonn,easy
AUTHOR
STATUS
approved