A216756 - OEIS

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A216756 as a simple table

n	a(n)
0	2
1	5
2	21
3	219
4	12686
5	15636041
6	4101615513409
7	12983864742986180266005
8	588668718546098799238432431873920456606
9	93859726557327916653208320240553220872245170780539985934198524439788

[2,5,21,219,12686,15636041,4101615513409, 12983864742986180266005, 588668718546098799238432431873920456606, 93859726557327916653208320240553220872245170780539\ 985934198524439788]