A220948 - cp's OEIS frontend

A220948 Expansion of (1-x)^2(1-3x)/(1-9x+28x^2-35x^3+15x^4-x^5).

n	a(n)
0	1
1	4
2	15
3	55
4	200
5	726
6	2638
7	9604
8	35037
9	128061
10	468809
11	1718446
12	6305546
13	23155863
14	85089015
15	312823200
16	1150506841
17	4232595095
18	15574796945
19	57320990295
20	210990647105
21	776707569176
22	2859475304889
23	10527898398268
24	38763003252400
25	142727886900676
26	525547912974105

[1, 4, 15, 55, 200, 726, 2638, 9604, 35037, 128061, 468809, 1718446, 6305546, 23155863, 85089015, 312823200, 1150506841, 4232595095, 15574796945, 57320990295, 210990647105, 776707569176, 2859475304889, 10527898398268, 38763003252400, 142727886900676, 525547912974105]

cp's OEIS Frontend

A220948 Expansion of (1-x)^2(1-3x)/(1-9x+28x^2-35x^3+15x^4-x^5).

Table of values

List of values

cp's OEIS Frontend

A220948 Expansion of (1-x)^2*(1-3*x)/(1-9*x+28*x^2-35*x^3+15*x^4-x^5).

Table of values

List of values

A220948 Expansion of (1-x)^2(1-3x)/(1-9x+28x^2-35x^3+15x^4-x^5).