A139126 - OEIS

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A139126 as a simple table

n	a(n)
1	0
2	7
3	7
4	18
5	19
6	90
7	91
8	271
9	1751
10	18807
11	56589
12	56589
13	56589
14	56589
15	899791
16	899791
17	2814790
18	7635171
19	7635171
20	39727671
21	99530619
22	233093807
23	233093807
24	233093807
25	233093807

[0,7,7,18,19,90,91,271,1751,18807,56589,56589, 56589,56589,899791,899791,2814790,7635171,7635171, 39727671,99530619,233093807,233093807,233093807, 233093807]