A108993 - OEIS

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A108993 as a simple table

n	a(n)
0	1
1	1
2	3
3	19
4	205
5	3276
6	70852
7	1953715
8	65904057
9	2639266228
10	122677374326
11	6503266277223
12	387708627582311
13	25700183133977665
14	1876381387159576676
15	149695388098709302361
16	12961535832843534300945

[1,1,3,19,205,3276,70852,1953715,65904057, 2639266228,122677374326,6503266277223, 387708627582311,25700183133977665, 1876381387159576676,149695388098709302361, 12961535832843534300945]