a(n) = Sum_{k=0..m} (k+1) * A026082(n, k), where 0 <= k <= m, m=n for n=0,1,2,3; m=2n for n >= 4.
A027319
a(n) = Sum_{k=0..m} (k+1) * A026082(n, k), where 0 <= k <= m, m=n for n=0,1,2,3; m=2n for n >= 4.
Terms
- a(0) =1a(1) =3a(2) =8a(3) =20a(4) =120a(5) =432a(6) =1512a(7) =5184a(8) =17496a(9) =58320a(10) =192456a(11) =629856a(12) =2047032a(13) =6613488a(14) =21257640a(15) =68024448a(16) =216827928a(17) =688747536a(18) =2181033864a(19) =6887475360a(20) =21695547384a(21) =68186006064a(22) =213856109928a(23) =669462604992
External references
- oeis: A027319