A042790 - OEIS

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A042790 as a simple table

n	a(n)
0	30
1	61
2	213
3	2404
4	2617
5	20723
6	23340
7	90743
8	204826
9	1114873
10	1319699
11	2434572
12	3754271
13	17451656
14	527303951
15	2126667460
16	2653971411
17	4780638871
18	7434610282
19	41953690281
20	91341990844
21	315979662813

[30,61,213,2404,2617,20723,23340,90743,204826, 1114873,1319699,2434572,3754271,17451656, 527303951,2126667460,2653971411,4780638871, 7434610282,41953690281,91341990844,315979662813]