A221859 - cp's OEIS frontend

A221859 Expansion of (1-3x+x^2)(1-2x)/(1-9x+28x^2-35x^3+15*x^4-x^5).

n	a(n)
0	1
1	4
2	15
3	56
4	209
5	779
6	2898
7	10760
8	39882
9	147612
10	545721
11	2015721
12	7440251
13	27448008
14	101217076
15	373128151
16	1375167467
17	5067236766
18	18669118971
19	68774597447
20	253334948791
21	933111590565
22	3436767111783
23	12657552835178
24	46616152422035
25	171677402416052

[1, 4, 15, 56, 209, 779, 2898, 10760, 39882, 147612, 545721, 2015721, 7440251, 27448008, 101217076, 373128151, 1375167467, 5067236766, 18669118971, 68774597447, 253334948791, 933111590565, 3436767111783, 12657552835178, 46616152422035, 171677402416052]

cp's OEIS Frontend

A221859 Expansion of (1-3x+x^2)(1-2x)/(1-9x+28x^2-35x^3+15*x^4-x^5).

Table of values

List of values

cp's OEIS Frontend

A221859 Expansion of (1-3*x+x^2)*(1-2*x)/(1-9*x+28*x^2-35*x^3+15*x^4-x^5).

Table of values

List of values

A221859 Expansion of (1-3x+x^2)(1-2x)/(1-9x+28x^2-35x^3+15*x^4-x^5).