A224742 - OEIS

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A224742 as a simple table

n	a(n)
1	538
2	9554
3	107665
4	1644874
5	21910274
6	316084673
7	4390392346
8	62260133978
9	873935026817
10	12334039384018
11	173598561450322
12	2446847686729409
13	34462955221735786
14	485580984830908274
15	6840489581505653009

[538,9554,107665,1644874,21910274,316084673, 4390392346,62260133978,873935026817, 12334039384018,173598561450322,2446847686729409, 34462955221735786,485580984830908274, 6840489581505653009]