A012279 - OEIS

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A012279 as a simple table

n	a(n)
0	1
1	0
2	1
3	3
4	16
5	70
6	580
7	3850
8	39940
9	350544
10	4408460
11	48605788
12	715662176
13	9518173080
14	160469679136
15	2503106438040
16	47524013744272
17	851125166412928
18	17967763294589776
19	363412179220061872

[1,0,1,3,16,70,580,3850,39940,350544,4408460, 48605788,715662176,9518173080,160469679136, 2503106438040,47524013744272,851125166412928, 17967763294589776,363412179220061872]