A370186 - cp's OEIS frontend

A370186 Coefficient of x^n in the expansion of ( (1+x) * (1+x+x^3)^2 )^n.

n	a(n)
0	1
1	3
2	15
3	90
4	583
5	3913
6	26790
7	185839
8	1301575
9	9183681
10	65181645
11	464858661
12	3328503814
13	23913207750
14	172295708971
15	1244484142765
16	9008351053031
17	65332552755149
18	474622993450725
19	3453219378684621
20	25158758123093013
21	183521479226172667
22	1340195580366321837

[1, 3, 15, 90, 583, 3913, 26790, 185839, 1301575, 9183681, 65181645, 464858661, 3328503814, 23913207750, 172295708971, 1244484142765, 9008351053031, 65332552755149, 474622993450725, 3453219378684621, 25158758123093013, 183521479226172667, 1340195580366321837]

cp's OEIS Frontend

A370186 Coefficient of x^n in the expansion of ( (1+x) * (1+x+x^3)^2 )^n.

Table of values

List of values