A359974 - OEIS

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A359974 as a simple table

n	a(n)
1	3
2	6
3	26
4	93
5	424
6	876
7	2785
8	5542
9	11575
10	18761
11	40249
12	57399
13	109376
14	155965
15	227884
16	322377
17	532454
18	676282
19	1056010
20	1334975
21	1767798
22	2240664
23	3252047
24	3882192
25	5226897

[3,6,26,93,424,876,2785,5542,11575,18761,40249, 57399,109376,155965,227884,322377,532454,676282, 1056010,1334975,1767798,2240664,3252047,3882192, 5226897]