Triangle read by rows: T(n,m) = (m/(n-m))*Sum_{k=1..n-m}((-1)^k*binomial(m-1,k-1)*binomial(3*(n-m)-k-1,n-m-k)), T(n,n)=1.
A271460
Triangle read by rows: T(n,m) = (m/(n-m))*Sum_{k=1..n-m}((-1)^k*binomial(m-1,k-1)*binomial(3*(n-m)-k-1,n-m-k)), T(n,n)=1.
Terms
- a(0) =1a(1) =-1a(2) =1a(3) =-2a(4) =-2a(5) =1a(6) =-7a(7) =-3a(8) =-3a(9) =1a(10) =-30a(11) =-10a(12) =-3a(13) =-4a(14) =1a(15) =-143a(16) =-42a(17) =-10a(18) =-2a(19) =-5a(20) =1a(21) =-728a(22) =-198a(23) =-42a(24) =-8a(25) =0a(26) =-6a(27) =1a(28) =-3876a(29) =-1001
External references
- oeis: A271460