A370242 - cp's OEIS frontend

A370242 Coefficient of x^n in the expansion of ( 1/(1-x)^2 * (1+x^2) )^n.

n	a(n)
0	1
1	2
2	12
3	74
4	480
5	3202
6	21756
7	149746
8	1040640
9	7285538
10	51307212
11	363057114
12	2579270304
13	18385404546
14	131429288828
15	941857237474
16	6764184258560
17	48671099313730
18	350799656912652
19	2532218940625642
20	18303373070813280
21	132462237913391362
22	959699439413581692

[1, 2, 12, 74, 480, 3202, 21756, 149746, 1040640, 7285538, 51307212, 363057114, 2579270304, 18385404546, 131429288828, 941857237474, 6764184258560, 48671099313730, 350799656912652, 2532218940625642, 18303373070813280, 132462237913391362, 959699439413581692]

cp's OEIS Frontend

A370242 Coefficient of x^n in the expansion of ( 1/(1-x)^2 * (1+x^2) )^n.

Table of values

List of values