G.f.: Sum_{n>=0} x^n * Product_{k=0..n-1} ( 1 + (1+x)^(2*n+k) ).
A338180
G.f.: Sum_{n>=0} x^n * Product_{k=0..n-1} ( 1 + (1+x)^(2*n+k) ).
Terms
- a(0) =1a(1) =2a(2) =6a(3) =27a(4) =152a(5) =982a(6) =7170a(7) =57745a(8) =506426a(9) =4787074a(10) =48377495a(11) =519377787a(12) =5892707464a(13) =70345730334a(14) =880325589031
External references
- oeis: A338180