A124541 - cp's OEIS frontend

A124541 G.f.: A(x) = R_2(x)/R_1(x), where R_2(x) and R_1(x) are the g.f.s of row 2 (A124542) and row 1 (A124531), respectively, of table A124540.

n	a(n)
0	1
1	1
2	4
3	15
4	63
5	295
6	1502
7	8167
8	46873
9	281672
10	1761798
11	11418480
12	76415644
13	526594846
14	3728435747
15	27073765165
16	201325681384
17	1531247489953
18	11899881220174
19	94409837555587
20	764105555574024
21	6304959856949278

[1, 1, 4, 15, 63, 295, 1502, 8167, 46873, 281672, 1761798, 11418480, 76415644, 526594846, 3728435747, 27073765165, 201325681384, 1531247489953, 11899881220174, 94409837555587, 764105555574024, 6304959856949278]

cp's OEIS Frontend

A124541 G.f.: A(x) = R_2(x)/R_1(x), where R_2(x) and R_1(x) are the g.f.s of row 2 (A124542) and row 1 (A124531), respectively, of table A124540.

Table of values

List of values