A104598 - OEIS

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A104598 as a simple table

n	a(n)
1	1
2	10
3	68
4	394
5	2092
6	10516
7	50920
8	239962
9	1107836
10	5033020
11	22572376
12	100168260
13	440604088
14	1923626344
15	8344694224
16	35998921978
17	154546983580
18	660652406572
19	2813422792696
20	11940478362796
21	50522190460072

[1,10,68,394,2092,10516,50920,239962,1107836, 5033020,22572376,100168260,440604088,1923626344, 8344694224,35998921978,154546983580,660652406572, 2813422792696,11940478362796,50522190460072]