A053910 - OEIS

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A053910 as a simple table

n	a(n)
1	1
2	3
3	4
4	13
5	14
6	31
7	263
8	264
9	3114
10	4119
11	24737
12	81619
13	834386
14	1382737
15	9959514
16	10775719
17	341608987
18	836460469
19	998053937
20	24737858031
21	40201507014
22	99599046013
23	2488372283063
24	8361615872313

[1,3,4,13,14,31,263,264,3114,4119,24737,81619, 834386,1382737,9959514,10775719,341608987, 836460469,998053937,24737858031,40201507014, 99599046013,2488372283063,8361615872313]