A128542 a(n) = ((2n)^(2n) - 1)/((2n+1)*(2n-1)).
0, 1, 17, 1333, 266305, 101010101, 62350352785, 56984650387477, 72340172838076673, 121815504877079063701, 262801002506265664160401, 706890015246831381773595701, 2319540481478754999041880822337, 9120177155862455275254332279111413
Offset: 0
Keywords
Links
- G. C. Greubel, Table of n, a(n) for n = 0..190
Programs
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GAP
Concatenation([0], List([1..20], n-> ((2*n)^(2*n)-1)/(4*n^2 -1) )); # G. C. Greubel, Jul 11 2019
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Magma
[0] cat [((2*n)^(2*n)-1)/(4*n^2 -1): n in [1..20]]; // G. C. Greubel, Jul 11 2019
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Mathematica
Join[{0}, Table[((2n)^(2n)-1)/(4n^2-1),{n,1,20}]] -
PARI
A128542(n)=((n+=n)^n-1)/(n^2-1) \\ M. F. Hasler, Oct 31 2014
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Sage
[0]+[((2*n)^(2*n)-1)/(4*n^2 -1) for n in (1..20)] # G. C. Greubel, Jul 11 2019
Formula
Extensions
a(0)=0 added by M. F. Hasler, Oct 31 2014
Comments