A025930 - OEIS

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A025930 as a simple table

n	a(n)
0	1
1	16
2	165
3	1400
4	10661
5	75936
6	517525
7	3421000
8	22124421
9	140796656
10	885205685
11	5513890200
12	34098207781
13	209668346176
14	1283419890645
15	7827611393000
16	47601257612741
17	288785879108496
18	1748608103548405

[1,16,165,1400,10661,75936,517525,3421000, 22124421,140796656,885205685,5513890200, 34098207781,209668346176,1283419890645, 7827611393000,47601257612741,288785879108496, 1748608103548405]