A308520 - cp's OEIS frontend

A308520 Expansion of e.g.f. exp(x)(1 + x + x^2/2)(sec(x) + tan(x)).

n	a(n)
0	1
1	3
2	9
3	27
4	84
5	287
6	1116
7	4984
8	25368
9	145277
10	924684
11	6475018
12	49464756
13	409371731
14	3648595216
15	34841512504
16	354892721168
17	3840839273849
18	44012775982132
19	532368664987942
20	6778328366073724
21	90619575089479631
22	1269184691838666152
23	18583725601041230532

[1, 3, 9, 27, 84, 287, 1116, 4984, 25368, 145277, 924684, 6475018, 49464756, 409371731, 3648595216, 34841512504, 354892721168, 3840839273849, 44012775982132, 532368664987942, 6778328366073724, 90619575089479631, 1269184691838666152, 18583725601041230532]

cp's OEIS Frontend

A308520 Expansion of e.g.f. exp(x)(1 + x + x^2/2)(sec(x) + tan(x)).

Table of values

List of values

cp's OEIS Frontend

A308520 Expansion of e.g.f. exp(x)*(1 + x + x^2/2)*(sec(x) + tan(x)).

Table of values

List of values

A308520 Expansion of e.g.f. exp(x)(1 + x + x^2/2)(sec(x) + tan(x)).