A217233 - cp's OEIS frontend

A217233 Expansion of (1-2x+x^2)/(1-3x-3*x^2+x^3).

n	a(n)
0	1
1	1
2	7
3	23
4	89
5	329
6	1231
7	4591
8	17137
9	63953
10	238679
11	890759
12	3324361
13	12406681
14	46302367
15	172802783
16	644908769
17	2406832289
18	8982420391
19	33522849271
20	125108976697
21	466913057513
22	1742543253359
23	6503259955919
24	24270496570321
25	90578726325361

[1, 1, 7, 23, 89, 329, 1231, 4591, 17137, 63953, 238679, 890759, 3324361, 12406681, 46302367, 172802783, 644908769, 2406832289, 8982420391, 33522849271, 125108976697, 466913057513, 1742543253359, 6503259955919, 24270496570321, 90578726325361]

cp's OEIS Frontend

A217233 Expansion of (1-2x+x^2)/(1-3x-3*x^2+x^3).

Table of values

List of values

cp's OEIS Frontend

A217233 Expansion of (1-2*x+x^2)/(1-3*x-3*x^2+x^3).

Table of values

List of values

A217233 Expansion of (1-2x+x^2)/(1-3x-3*x^2+x^3).