Triangle T(n, k) = c(n)/(c(k)*c(n-k)) where c(n) = (n-2)!*(n-1)!*n!*(n+1)!/12 with c(0) = c(1) = 1 and c(2) = 2, read by rows.
A173889
Triangle T(n, k) = c(n)/(c(k)*c(n-k)) where c(n) = (n-2)!*(n-1)!*n!*(n+1)!/12 with c(0) = c(1) = 1 and c(2) = 2, read by rows.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =1a(6) =1a(7) =12a(8) =12a(9) =1a(10) =1a(11) =120a(12) =720a(13) =120a(14) =1a(15) =1a(16) =360a(17) =21600a(18) =21600a(19) =360a(20) =1a(21) =1a(22) =840a(23) =151200a(24) =1512000a(25) =151200a(26) =840a(27) =1a(28) =1a(29) =1680
External references
- oeis: A173889