a(n) = Sum_{k=0..n} 3^(n-k)*A123125(n, k).
A122704
a(n) = Sum_{k=0..n} 3^(n-k)*A123125(n, k).
Terms
- a(0) =1a(1) =1a(2) =4a(3) =22a(4) =160a(5) =1456a(6) =15904a(7) =202672a(8) =2951680a(9) =48361216a(10) =880405504a(11) =17630351872a(12) =385148108800
External references
- oeis: A122704