Column 1 of triangle A107867; a(n) = binomial( n*(n+1)/2 + n+1, n).
A107869
Column 1 of triangle A107867; a(n) = binomial( n*(n+1)/2 + n+1, n).
Terms
- a(0) =1a(1) =3a(2) =15a(3) =120a(4) =1365a(5) =20349a(6) =376740a(7) =8347680a(8) =215553195a(9) =6358402050a(10) =210980549208
External references
- oeis: A107869