A152171 - cp's OEIS frontend

A152171 G.f. := (1-sqrt(1-4x+4x^2-4*x^3))/(2(1-x+x^2)x).

n	a(n)
0	1
1	1
2	1
3	2
4	5
5	12
6	29
7	73
8	190
9	505
10	1363
11	3727
12	10306
13	28771
14	80975
15	229512
16	654545
17	1876899
18	5408142
19	15650939
20	45470545
21	132573406
22	387775229
23	1137575084
24	3346189045
25	9867291817
26	29163523978
27	86377998093
28	256343194011

[1, 1, 1, 2, 5, 12, 29, 73, 190, 505, 1363, 3727, 10306, 28771, 80975, 229512, 654545, 1876899, 5408142, 15650939, 45470545, 132573406, 387775229, 1137575084, 3346189045, 9867291817, 29163523978, 86377998093, 256343194011]

cp's OEIS Frontend

A152171 G.f. := (1-sqrt(1-4x+4x^2-4*x^3))/(2(1-x+x^2)x).

Table of values

List of values

cp's OEIS Frontend

A152171 G.f. := (1-sqrt(1-4*x+4*x^2-4*x^3))/(2(1-x+x^2)x).

Table of values

List of values

A152171 G.f. := (1-sqrt(1-4x+4x^2-4*x^3))/(2(1-x+x^2)x).