A115189 - OEIS

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A115189 as a simple table

n	a(n)
0	1
1	40
2	466
3	4870
4	50053
5	516256
6	5371210
7	56422444
8	598180570
9	6395471992
10	68897550064
11	747270112390
12	8154207352045
13	89462667739360
14	986322436120690
15	10922076949690180
16	121428345789834430
17	1354895520307913680

[1,40,466,4870,50053,516256,5371210,56422444, 598180570,6395471992,68897550064,747270112390, 8154207352045,89462667739360,986322436120690, 10922076949690180,121428345789834430, 1354895520307913680]