A081421 - OEIS

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A081421 as a simple table

n	a(n)
0	1
1	17
2	353
3	8177
4	198593
5	4912337
6	122336033
7	3054149297
8	76315468673
9	1907542343057
10	47685459212513
11	1192108586037617
12	29802463602463553
13	745059330625296977
14	18626462930705797793
15	465661390253305305137

[1,17,353,8177,198593,4912337,122336033, 3054149297,76315468673,1907542343057, 47685459212513,1192108586037617,29802463602463553, 745059330625296977,18626462930705797793, 465661390253305305137]