T(n, k) = binomial(n-k-1, k-1)*(n-k)!/k! for n >= 0 and 0 <= k <= floor(n/2). Irregular triangle read by rows.

A330609

T(n, k) = binomial(n-k-1, k-1)*(n-k)!/k! for n >= 0 and 0 <= k <= floor(n/2). Irregular triangle read by rows.

Terms

    a(0) =1a(1) =0a(2) =0a(3) =1a(4) =0a(5) =2a(6) =0a(7) =6a(8) =1a(9) =0a(10) =24a(11) =6a(12) =0a(13) =120a(14) =36a(15) =1a(16) =0a(17) =720a(18) =240a(19) =12a(20) =0a(21) =5040a(22) =1800a(23) =120a(24) =1a(25) =0a(26) =40320a(27) =15120a(28) =1200a(29) =20

External references