A387430 - cp's OEIS frontend

A387430 a(n) = Sum_{k=0..n} (n-i)^k * (n+i)^(n-k) * binomial(n,k)^2, where i is the imaginary unit.

n	a(n)
0	1
1	2
2	26
3	576
4	18886
5	822800
6	44758244
7	2920443904
8	222277449286
9	19333107926208
10	1891679562586252
11	205658657276205056
12	24594577004735218716
13	3208651043895419972096
14	453493188773477070618248
15	69025100503218462336614400
16	11256667883184684951198851654
17	1958143582960886584057480612864

[1, 2, 26, 576, 18886, 822800, 44758244, 2920443904, 222277449286, 19333107926208, 1891679562586252, 205658657276205056, 24594577004735218716, 3208651043895419972096, 453493188773477070618248, 69025100503218462336614400, 11256667883184684951198851654, 1958143582960886584057480612864]

cp's OEIS Frontend

A387430 a(n) = Sum_{k=0..n} (n-i)^k * (n+i)^(n-k) * binomial(n,k)^2, where i is the imaginary unit.

Table of values

List of values