A101507 - OEIS

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A101507 as a simple table

n	a(n)
1	2
2	3
3	15
4	20
5	58
6	2893
7	3172
8	13778
9	36596
10	63894
11	208744
12	296557
13	404667
14	11500740
15	17800369
16	37858613
17	38393813
18	902477623
19	4126573365
20	79491128275
21	338814192247
22	1599109448865

[2,3,15,20,58,2893,3172,13778,36596,63894,208744, 296557,404667,11500740,17800369,37858613,38393813, 902477623,4126573365,79491128275,338814192247, 1599109448865]