a(n) = Sum_{k=0..n} binomial(3*n, n-k) * v(k), where v(k) is the number of overpartitions of n (A015128).
A356290
a(n) = Sum_{k=0..n} binomial(3*n, n-k) * v(k), where v(k) is the number of overpartitions of n (A015128).
Terms
- a(0) =1a(1) =5a(2) =31a(3) =200a(4) =1309a(5) =8627a(6) =57082a(7) =378648a(8) =2516111a(9) =16740913a(10) =111494801a(11) =743137984a(12) =4956359312a(13) =33074272702a(14) =220810039566
External references
- oeis: A356290