A351858 - cp's OEIS frontend

A351858 a(n) = [x^n] (1 + x + x^2)^(3n)/(1 + x)^(2n).

n	a(n)
0	1
1	1
2	7
3	19
4	103
5	376
6	1825
7	7547
8	35175
9	153838
10	708132
11	3181091
12	14616481
13	66582283
14	306501377
15	1407473269
16	6497464679
17	29991098982
18	138844558150
19	643215119214
20	2985368996228
21	13868212710623
22	64508509024241
23	300324344452479
24	1399598738196897
25	6527698842078501

[1, 1, 7, 19, 103, 376, 1825, 7547, 35175, 153838, 708132, 3181091, 14616481, 66582283, 306501377, 1407473269, 6497464679, 29991098982, 138844558150, 643215119214, 2985368996228, 13868212710623, 64508509024241, 300324344452479, 1399598738196897, 6527698842078501]

cp's OEIS Frontend

A351858 a(n) = [x^n] (1 + x + x^2)^(3n)/(1 + x)^(2n).

Table of values

List of values

cp's OEIS Frontend

A351858 a(n) = [x^n] (1 + x + x^2)^(3*n)/(1 + x)^(2*n).

Table of values

List of values

A351858 a(n) = [x^n] (1 + x + x^2)^(3n)/(1 + x)^(2n).