A128981 - OEIS

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A128981 as a simple table

n	a(n)
1	1
2	4
3	17
4	19
5	148
6	1577
7	3564
8	4388
9	5873
10	6639
11	8579
12	62500
13	376636
14	792949
15	996044
16	1174065
17	3333551
18	5179004
19	7516003

[1,4,17,19,148,1577,3564,4388,5873,6639,8579, 62500,376636,792949,996044,1174065,3333551, 5179004,7516003]