a(n) = Sum_{k=0..m} (k+1) * A026120(n, k), where m=0 for n=0,1; m=n for n >= 2.
A027326
a(n) = Sum_{k=0..m} (k+1) * A026120(n, k), where m=0 for n=0,1; m=n for n >= 2.
Terms
- a(0) =1a(1) =3a(2) =13a(3) =48a(4) =165a(5) =556a(6) =1836a(7) =5984a(8) =19302a(9) =61764a(10) =196361a(11) =620968a(12) =1955037a(13) =6132060a(14) =19171447a(15) =59770440a(16) =185888523a(17) =576870516a(18) =1786768047a(19) =5524718520a(20) =17056080375a(21) =52582317228a(22) =161900130438a(23) =497909056776
External references
- oeis: A027326