a(n) = S1(n, 6), where S1(n, t) = Sum_{k=0..n} (k^t * Sum_{j=0..k} binomial(n,j)).
A089663
a(n) = S1(n, 6), where S1(n, t) = Sum_{k=0..n} (k^t * Sum_{j=0..k} binomial(n,j)).
Terms
- a(0) =0a(1) =2a(2) =259a(3) =6284a(4) =77180a(5) =646960a(6) =4235864a(7) =23313408a(8) =112793088a(9) =493969920a(10) =1998346240a(11) =7577934848a(12) =27232132096a(13) =93517705216a(14) =308908943360a(15) =986642513920
External references
- oeis: A089663