a(n) = binomial(m+n-1,n)^2 - binomial(m+n,n+1)*binomial(m+n-2,n-1) with m=12.
A140925
a(n) = binomial(m+n-1,n)^2 - binomial(m+n,n+1)*binomial(m+n-2,n-1) with m=12.
Terms
- a(0) =1a(1) =66a(2) =1716a(3) =26026a(4) =273273a(5) =2186184a(6) =14158144a(7) =77364144a(8) =367479684a(9) =1551580888a(10) =5924217936a(11) =20734762776a(12) =67255063876a(13) =203982391536a(14) =582806832960
External references
- oeis: A140925