A349430 - OEIS

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A349430 as a simple table

n	a(n)
0	1
1	1
2	2
3	4
4	10
5	20
6	58
7	124
8	344
9	811
10	2071
11	4973
12	15454
13	36031
14	96212
15	237563
16	668695
17	1626751
18	4674373
19	11470722
20	31460456
21	81705943
22	224598113

[1,1,2,4,10,20,58,124,344,811,2071,4973,15454, 36031,96212,237563,668695,1626751,4674373, 11470722,31460456,81705943,224598113]