Triangle T(n,k) read by rows: T(n, k) = (4*n-4*k+1)*T(n-1, k-1) + (4*k-3)*T(n-1, k) + 4*T(n-2, k-1) with T(n, 1) = T(n, n) = 1.

A144441

Triangle T(n,k) read by rows: T(n, k) = (4*n-4*k+1)*T(n-1, k-1) + (4*k-3)*T(n-1, k) + 4*T(n-2, k-1) with T(n, 1) = T(n, n) = 1.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =14a(5) =1a(6) =1a(7) =83a(8) =83a(9) =1a(10) =1a(11) =432a(12) =1550a(13) =432a(14) =1a(15) =1a(16) =2181a(17) =19898a(18) =19898a(19) =2181a(20) =1a(21) =1a(22) =10930a(23) =217887a(24) =523548a(25) =217887a(26) =10930a(27) =1a(28) =1a(29) =54679

External references