A387459 - cp's OEIS frontend

A387459 a(n) = Sum_{k=0..n} (n-i)^k * (n+i)^(n-k), where i is the imaginary unit.

n	a(n)
0	1
1	2
2	11
3	96
4	1121
5	16280
6	281987
7	5666304
8	129488641
9	3315041568
10	93958705499
11	2920298135040
12	98749216968481
13	3608920706225536
14	141743544911838547
15	5953777300691189760
16	266315973364196014081
17	12638365012375994704384
18	634207216217264733599531
19	33552879853099295377612800

[1, 2, 11, 96, 1121, 16280, 281987, 5666304, 129488641, 3315041568, 93958705499, 2920298135040, 98749216968481, 3608920706225536, 141743544911838547, 5953777300691189760, 266315973364196014081, 12638365012375994704384, 634207216217264733599531, 33552879853099295377612800]

cp's OEIS Frontend

A387459 a(n) = Sum_{k=0..n} (n-i)^k * (n+i)^(n-k), where i is the imaginary unit.

Table of values

List of values