A301481 - OEIS

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A301481 as a simple table

n	a(n)
0	1
1	1
2	2
3	4
4	12
5	58
6	2381
7	14026281
8	29284932065996445
9	468863491068204425232922367150021
10	1994324729204021501147398087008429476673379600542622915802043462326345

[1,1,2,4,12,58,2381,14026281,29284932065996445, 468863491068204425232922367150021, 19943247292040215011473980870084294766733796005426\ 22915802043462326345]