A293138 - cp's OEIS frontend

A293138 E.g.f.: Product_{m>0} (1+x^m+x^(2*m)/2!).

n	a(n)
0	1
1	1
2	3
3	12
4	72
5	480
6	3780
7	35280
8	372960
9	4263840
10	54432000
11	758419200
12	11436163200
13	185253868800
14	3214699488000
15	59172265152000
16	1163830187520000
17	24097823253504000
18	525794940582912000
19	12073276215576576000
20	290883846352619520000
21	7318777466097377280000

[1, 1, 3, 12, 72, 480, 3780, 35280, 372960, 4263840, 54432000, 758419200, 11436163200, 185253868800, 3214699488000, 59172265152000, 1163830187520000, 24097823253504000, 525794940582912000, 12073276215576576000, 290883846352619520000, 7318777466097377280000]

cp's OEIS Frontend

A293138 E.g.f.: Product_{m>0} (1+x^m+x^(2*m)/2!).

Table of values

List of values