A370160 - cp's OEIS frontend

A370160 Coefficient of x^n in the expansion of ( (1+x)^2 * (1+x+x^2)^2 )^n.

n	a(n)
0	1
1	4
2	32
3	286
4	2688
5	26004
6	256322
7	2559960
8	25816576
9	262307824
10	2681024032
11	27534988936
12	283926200706
13	2937573629800
14	30480431060160
15	317053438632786
16	3305105501423616
17	34519689280675808
18	361146528603877520
19	3784045825018539968
20	39702608870540290688

[1, 4, 32, 286, 2688, 26004, 256322, 2559960, 25816576, 262307824, 2681024032, 27534988936, 283926200706, 2937573629800, 30480431060160, 317053438632786, 3305105501423616, 34519689280675808, 361146528603877520, 3784045825018539968, 39702608870540290688]

cp's OEIS Frontend

A370160 Coefficient of x^n in the expansion of ( (1+x)^2 * (1+x+x^2)^2 )^n.

Table of values

List of values