A249286 - OEIS

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A249286 as a simple table

n	a(n)
1	524
2	2228
3	9504
4	40588
5	173368
6	740616
7	3164312
8	13520668
9	57772560
10	246857788
11	1054810472
12	4507167504
13	19258980852
14	82293014888
15	351635522044
16	1502528043892
17	6420257600360
18	27433569837528
19	117222829267252

[524,2228,9504,40588,173368,740616,3164312, 13520668,57772560,246857788,1054810472,4507167504, 19258980852,82293014888,351635522044, 1502528043892,6420257600360,27433569837528, 117222829267252]