G.f.: Sum_{n>=0} x^n * Product_{k=0..n-1} ( 1 + (1+x)^(n+k) ).
A338179
G.f.: Sum_{n>=0} x^n * Product_{k=0..n-1} ( 1 + (1+x)^(n+k) ).
Terms
- a(0) =1a(1) =2a(2) =5a(3) =18a(4) =78a(5) =389a(6) =2171a(7) =13293a(8) =88234a(9) =628645a(10) =4772159a(11) =38367795a(12) =325108942a(13) =2891485361a(14) =26898627654a(15) =260948353868
External references
- oeis: A338179