A370244 - cp's OEIS frontend

A370244 Coefficient of x^n in the expansion of ( 1/(1-x) * (1+x^2)^3 )^n.

n	a(n)
0	1
1	1
2	9
3	37
4	221
5	1176
6	6759
7	38368
8	222189
9	1290367
10	7551534
11	44367918
12	261789647
13	1549582126
14	9198837384
15	54740021712
16	326445873389
17	1950448508265
18	11673082484595
19	69965814023259
20	419923664517546
21	2523379461715576
22	15180084331541402
23	91411979525372616

[1, 1, 9, 37, 221, 1176, 6759, 38368, 222189, 1290367, 7551534, 44367918, 261789647, 1549582126, 9198837384, 54740021712, 326445873389, 1950448508265, 11673082484595, 69965814023259, 419923664517546, 2523379461715576, 15180084331541402, 91411979525372616]

cp's OEIS Frontend

A370244 Coefficient of x^n in the expansion of ( 1/(1-x) * (1+x^2)^3 )^n.

Table of values

List of values