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)*(3*i-2) ) and m = 3, read by rows.

A156727

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)*(3*i-2) ) and m = 3, read by rows.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =-3a(5) =1a(6) =1a(7) =45a(8) =45a(9) =1a(10) =1a(11) =-1215a(12) =18225a(13) =-1215a(14) =1a(15) =1a(16) =47385a(17) =19190925a(18) =19190925a(19) =47385a(20) =1a(21) =1a(22) =-2416635a(23) =38170749825a(25) =38170749825a(26) =-2416635a(27) =1a(28) =1a(29) =152248005a(34) =152248005

External references