A275698 - OEIS

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A275698 as a simple table

n	a(n)
0	2
1	5
2	13
3	133
4	17293
5	298995973
6	89398590973228813
7	7992108067998667938125889533702533
8	63873791370569400659097694858350356285036046451665934814399129508493

[2,5,13,133,17293,298995973,89398590973228813, 7992108067998667938125889533702533, 63873791370569400659097694858350356285036046451665\ 934814399129508493]