Triangle, read by rows, T(n, k) = Sum_{j=0..k} (n+k)!/((n-j)!*(k-j)!*j!) + Sum_{j=0..n-k} (2*n-k)!/((n-j)!*(n-k-j)!*j!).

A176081

Triangle, read by rows, T(n, k) = Sum_{j=0..k} (n+k)!/((n-j)!*(k-j)!*j!) + Sum_{j=0..n-k} (2*n-k)!/((n-j)!*(n-k-j)!*j!).

Terms

    a(0) =2a(1) =5a(2) =5a(3) =43a(4) =18a(5) =43a(6) =681a(7) =146a(8) =146a(9) =681a(10) =14631a(11) =2580a(12) =630a(13) =2580a(14) =14631a(15) =389593a(16) =63162a(17) =8267a(18) =8267a(19) =63162a(20) =389593a(21) =12314149a(22) =1871611a(23) =220654a(24) =38472a(25) =220654a(26) =1871611a(27) =12314149a(28) =449324305a(29) =64578292

External references