A387402 - cp's OEIS frontend

A387402 a(n) = Sum_{k=0..n} (1-i)^k * (1+i)^(n-k) * binomial(n+2,k) * binomial(n+2,n-k), where i is the imaginary unit.

n	a(n)
0	1
1	6
2	32
3	160
4	780
5	3752
6	17920
7	85248
8	404640
9	1918400
10	9090048
11	43064320
12	204032192
13	966887040
14	4583424000
15	21735350272
16	103114538496
17	489392157696
18	2323701678080
19	11037970513920
20	52454251902976
21	249373626208256
22	1186024281341952
23	5642924625100800
24	26858183388774400
25	127880625111662592

[1, 6, 32, 160, 780, 3752, 17920, 85248, 404640, 1918400, 9090048, 43064320, 204032192, 966887040, 4583424000, 21735350272, 103114538496, 489392157696, 2323701678080, 11037970513920, 52454251902976, 249373626208256, 1186024281341952, 5642924625100800, 26858183388774400, 127880625111662592]

cp's OEIS Frontend

A387402 a(n) = Sum_{k=0..n} (1-i)^k * (1+i)^(n-k) * binomial(n+2,k) * binomial(n+2,n-k), where i is the imaginary unit.

Table of values

List of values