A297797 - OEIS

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A297797 as a simple table

n	a(n)
1	1
2	11
3	37
4	108
5	533
6	2434
7	10287
8	45968
9	207906
10	927565
11	4149639
12	18631844
13	83542062
14	374482908
15	1679592819
16	7532686680
17	33779595704
18	151490828968
19	679394507158
20	3046851336221
21	13664151868643
22	61279503538129

[1,11,37,108,533,2434,10287,45968,207906,927565, 4149639,18631844,83542062,374482908,1679592819, 7532686680,33779595704,151490828968,679394507158, 3046851336221,13664151868643,61279503538129]