A251108 - OEIS

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A251108 as a simple table

n	a(n)
1	526
2	3616
3	19131
4	99147
5	549944
6	3097574
7	17154384
8	94541640
9	523362695
10	2902098174
11	16074820995
12	88991683894
13	492794584784
14	2729305867906
15	15115136455485
16	83704974778717
17	463549806671218
18	2567128453854706

[526,3616,19131,99147,549944,3097574,17154384, 94541640,523362695,2902098174,16074820995, 88991683894,492794584784,2729305867906, 15115136455485,83704974778717,463549806671218, 2567128453854706]