A027212 a(n) = Sum_{k=0..n} (k+1) * A026725(n, n-k).

1, 3, 8, 23, 55, 144, 328, 816, 1808, 4358, 9485, 22377, 48097, 111720, 237917, 546161, 1154827, 2626624, 5522464, 12467540, 26092324, 58546544, 122059348, 272479782, 566242186, 1258568324, 2608232758, 5775620396, 11940756076

Offset: 0

Author

Clark Kimberling

Keywords

• nonn

Programs

Maple

A027212 := proc(n)
    add( (k+1)*A026725(n,n-k),k=0..n) ;
end proc: # R. J. Mathar, Oct 21 2019

Extensions

Name corrected by R. J. Mathar, Oct 21 2019