A041405 - OEIS

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A041405 as a simple table

n	a(n)
0	1
1	1
2	3
3	4
4	11
5	15
6	26
7	249
8	1022
9	9447
10	10469
11	19916
12	50301
13	70217
14	190735
15	260952
16	7497391
17	7758343
18	23014077
19	30772420
20	84558917
21	115331337
22	199890254
23	1914343623
24	7857264746
25	72629726337

[1,1,3,4,11,15,26,249,1022,9447,10469,19916,50301, 70217,190735,260952,7497391,7758343,23014077, 30772420,84558917,115331337,199890254,1914343623, 7857264746,72629726337]