A370187 - cp's OEIS frontend

A370187 Coefficient of x^n in the expansion of ( (1+x)^2 * (1+x+x^3)^2 )^n.

n	a(n)
0	1
1	4
2	28
3	226
4	1940
5	17214
6	155914
7	1432106
8	13289076
9	124276528
10	1169346298
11	11057293526
12	104986087178
13	1000248093420
14	9557756114130
15	91559051752596
16	879027678226452
17	8455595252761536
18	81476137225450096
19	786286875175380088
20	7598503022428758570

[1, 4, 28, 226, 1940, 17214, 155914, 1432106, 13289076, 124276528, 1169346298, 11057293526, 104986087178, 1000248093420, 9557756114130, 91559051752596, 879027678226452, 8455595252761536, 81476137225450096, 786286875175380088, 7598503022428758570]

cp's OEIS Frontend

A370187 Coefficient of x^n in the expansion of ( (1+x)^2 * (1+x+x^3)^2 )^n.

Table of values

List of values