Column 2 of triangle A113993, also equals column 0 of A113983^3.
A113994
Column 2 of triangle A113993, also equals column 0 of A113983^3.
Terms
- a(0) =1a(1) =3a(2) =9a(3) =27a(4) =89a(5) =327a(6) =1353a(7) =6303a(8) =32953a(9) =192395a(10) =1247473a(11) =8931643a(12) =70221841a(13) =603040399a(14) =5628477521a(15) =56832554399a(16) =618172840753
External references
- oeis: A113994