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

Author

Clark Kimberling

Keywords

• nonn

Programs

Maple

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

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

Extensions

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