Regular triangle read by rows: T(n, k) = sum(i=0, n, sum(j=k, n, 3*(-1)^(k+j)*binomial(2*k,k)*binomial(j,i)*binomial(n,i)*binomial(i,n-j)/(2*(2*i-1)*(2*j+1)*(2*n-2*i-1)))).

A262886

Regular triangle read by rows: T(n, k) = sum(i=0, n, sum(j=k, n, 3*(-1)^(k+j)*binomial(2*k,k)*binomial(j,i)*binomial(n,i)*binomial(i,n-j)/(2*(2*i-1)*(2*j+1)*(2*n-2*i-1)))).

Terms

    a(0) =-2a(1) =0a(2) =6a(3) =0a(4) =0a(5) =24a(6) =0a(7) =0a(8) =4a(9) =118a(10) =0a(11) =0a(12) =0a(13) =60a(14) =696a(15) =0a(16) =0a(17) =0a(18) =12a(19) =720a(20) =4824a(21) =0a(22) =0a(23) =0a(24) =0a(25) =336a(26) =8288a(27) =38240a(28) =0a(29) =0

External references