a(n) = ((2*n-1)!/(2*n!*(n-2)!))*((n^3-3*n^2+2*n+2)/(n^2-1)).
A002739
a(n) = ((2*n-1)!/(2*n!*(n-2)!))*((n^3-3*n^2+2*n+2)/(n^2-1)).
Terms
- a(0) =1a(1) =10a(2) =91a(3) =651a(4) =4026a(5) =22737a(6) =120835a(7) =615043a(8) =3031678a(9) =14578928a(10) =68747966a(11) =319075550a(12) =1461581460a(13) =6621579135a(14) =29718121635a(15) =132302508195a(16) =584868588150
External references
- oeis: A002739