A387467 - cp's OEIS frontend

A387467 a(n) = Sum_{k=0..n} (1-ni)^k (1+ni)^(n-k) binomial(n,k)^2, where i is the imaginary unit.

n	a(n)
0	1
1	2
2	14
3	128
4	2566
5	44752
6	1523724
7	39267328
8	1893328966
9	64541150912
10	4029767542756
11	170848520912896
12	13100724115628956
13	664175960969073152
14	60396776494002647768
15	3563049510869692907520
16	374818464874078558810694
17	25220474024437034383526912
18	3012865557320147302034729844

[1, 2, 14, 128, 2566, 44752, 1523724, 39267328, 1893328966, 64541150912, 4029767542756, 170848520912896, 13100724115628956, 664175960969073152, 60396776494002647768, 3563049510869692907520, 374818464874078558810694, 25220474024437034383526912, 3012865557320147302034729844]

cp's OEIS Frontend

A387467 a(n) = Sum_{k=0..n} (1-ni)^k (1+ni)^(n-k) binomial(n,k)^2, where i is the imaginary unit.

Table of values

List of values

cp's OEIS Frontend

A387467 a(n) = Sum_{k=0..n} (1-n*i)^k * (1+n*i)^(n-k) * binomial(n,k)^2, where i is the imaginary unit.

Table of values

List of values

A387467 a(n) = Sum_{k=0..n} (1-ni)^k (1+ni)^(n-k) binomial(n,k)^2, where i is the imaginary unit.