Triangle T(n, k, m) = t(n,m)/( t(k,m) * t(n-k,m) ) with T(n, 0, m) = T(n, n, m) = 1, where t(n, m) = Product_{j=1..n} Product_{i=1..j-1} ( 1 - (m+1)*(i+1) ) and m = 3, read by rows.

A156692

Triangle T(n, k, m) = t(n,m)/( t(k,m) * t(n-k,m) ) with T(n, 0, m) = T(n, n, m) = 1, where t(n, m) = Product_{j=1..n} Product_{i=1..j-1} ( 1 - (m+1)*(i+1) ) and m = 3, read by rows.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =-7a(5) =1a(6) =1a(7) =77a(8) =77a(9) =1a(10) =1a(11) =-1155a(12) =12705a(13) =-1155a(14) =1a(15) =1a(16) =21945a(17) =3620925a(18) =3620925a(19) =21945a(20) =1a(21) =1a(22) =-504735a(23) =1582344225a(24) =-23735163375a(25) =1582344225a(26) =-504735a(27) =1a(28) =1a(29) =13627845

External references