A387403 - cp's OEIS frontend

A387403 a(n) = Sum_{k=0..n} (1-i)^k * (1+i)^(n-k) * binomial(n+3,k) * binomial(n+3,n-k), where i is the imaginary unit.

n	a(n)
0	1
1	8
2	50
3	280
4	1484
5	7616
6	38304
7	190080
8	934560
9	4564736
10	22189024
11	107476096
12	519180480
13	2502850560
14	12046666752
15	57912029184
16	278136798720
17	1334832967680
18	6402435630080
19	30695114813440
20	147110418036736
21	704860523102208
22	3376580007936000
23	16172904859238400

[1, 8, 50, 280, 1484, 7616, 38304, 190080, 934560, 4564736, 22189024, 107476096, 519180480, 2502850560, 12046666752, 57912029184, 278136798720, 1334832967680, 6402435630080, 30695114813440, 147110418036736, 704860523102208, 3376580007936000, 16172904859238400]

cp's OEIS Frontend

A387403 a(n) = Sum_{k=0..n} (1-i)^k * (1+i)^(n-k) * binomial(n+3,k) * binomial(n+3,n-k), where i is the imaginary unit.

Table of values

List of values