a(n) = exp(-1/4) * Sum_{k>=0} (4*k + 3)^n / (4^k * k!).
A355167
a(n) = exp(-1/4) * Sum_{k>=0} (4*k + 3)^n / (4^k * k!).
Terms
- a(0) =1a(1) =4a(2) =20a(3) =128a(4) =1008a(5) =9280a(6) =96704a(7) =1120768a(8) =14274816a(9) =197833728a(10) =2958521344a(11) =47415508992a(12) =809838505984
External references
- oeis: A355167