Triangle T(n, k) = binomial(binomial(n, 2) + k, k) + binomial(binomial(n, 2) + n-k, n-k) - binomial(binomial(n, 2) + n, n), read by rows.

A176567

Triangle T(n, k) = binomial(binomial(n, 2) + k, k) + binomial(binomial(n, 2) + n-k, n-k) - binomial(binomial(n, 2) + n, n), read by rows.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =-6a(8) =-6a(9) =1a(10) =1a(11) =-119a(12) =-154a(13) =-119a(14) =1a(15) =1a(16) =-1991a(17) =-2651a(18) =-2651a(19) =-1991a(20) =1a(21) =1a(22) =-38744a(23) =-50252a(24) =-52632a(25) =-50252a(26) =-38744a(27) =1a(28) =1a(29) =-888008

External references