A123871 - cp's OEIS frontend

A123871 Expansion of g.f.: (1+x+x^2)/(1-4x-4x^2).

n	a(n)
0	1
1	5
2	25
3	120
4	580
5	2800
6	13520
7	65280
8	315200
9	1521920
10	7348480
11	35481600
12	171320320
13	827207680
14	3994112000
15	19285278720
16	93117562880
17	449611366400
18	2170915717120
19	10482108334080
20	50612096204800
21	244376818155520
22	1179955657441280
23	5697329902387200

[1, 5, 25, 120, 580, 2800, 13520, 65280, 315200, 1521920, 7348480, 35481600, 171320320, 827207680, 3994112000, 19285278720, 93117562880, 449611366400, 2170915717120, 10482108334080, 50612096204800, 244376818155520, 1179955657441280, 5697329902387200]

cp's OEIS Frontend

A123871 Expansion of g.f.: (1+x+x^2)/(1-4x-4x^2).

Table of values

List of values

cp's OEIS Frontend

A123871 Expansion of g.f.: (1+x+x^2)/(1-4*x-4*x^2).

Table of values

List of values

A123871 Expansion of g.f.: (1+x+x^2)/(1-4x-4x^2).