A025183 a(n) = T(2n-1,n), where T is the array defined in A025177.

0, 4, 20, 111, 616, 3465, 19668, 112476, 647088, 3741156, 21718520, 126520240, 739225704, 4330188265, 25421864580, 149541718275, 881200519200, 5200715525016, 30736780735752, 181886951796886

Offset

1,2

Links

Table of n, a(n) for n=1..20.

Formula

Conjecture: 9*n*(10833*n-26779)*(3*n-4)*(3*n-2)*a(n) -3*(n-1)*(749757*n^3+5096

41*n^2-11324756*n+13648560)*a(n-1) -2*(2*n-5)*(4152209*n^3-25903434*n^2+5658913

6*n-40818816)*a(n-2) -36*(n-3)*(85207*n-129510)*(2*n-5)*(2*n-7)*a(n-3)=0. - R. J. Mathar, Feb 25 2015

Maple

A025183 := proc(n)
        A025177(2*n-1, n) ;
end proc: # R. J. Mathar, Jul 28 2016

Crossrefs

Sequence in context: A158827 A263854 A026156 * A014523 A153299 A239643

Adjacent sequences: A025180 A025181 A025182 * A025184 A025185 A025186

Keyword

nonn

Author

Clark Kimberling

Extensions

First term corrected. - R. J. Mathar, Feb 25 2015

Status

approved