a(n) = Sum_{k=0..n} binomial(n,k)^3 * 2^k.
A206178
a(n) = Sum_{k=0..n} binomial(n,k)^3 * 2^k.
Terms
- a(0) =1a(1) =3a(2) =21a(3) =171a(4) =1521a(5) =14283a(6) =138909a(7) =1385163a(8) =14072193a(9) =145039923a(10) =1512191781a(11) =15914734443a(12) =168802010001
External references
- oeis: A206178