a(n) = ((2*n+1)^(n+1) + (-1)^n)/(n+1)^2.
A273319
a(n) = ((2*n+1)^(n+1) + (-1)^n)/(n+1)^2.
Terms
- a(0) =2a(1) =2a(2) =14a(3) =150a(4) =2362a(5) =49210a(6) =1280582a(7) =40045166a(8) =1464047858a(9) =61310662578
External references
- oeis: A273319
A273319
a(n) = ((2*n+1)^(n+1) + (-1)^n)/(n+1)^2.