A283275 - OEIS

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A283275 as a simple table

n	a(n)
1	2
2	15
3	287
4	18320
5	3455416
6	1974531630
7	3418770498783
8	17870966063289283
9	282553643923249045737
10	13505171096689643652228930
11	1951495960309987636340762968396

[2,15,287,18320,3455416,1974531630,3418770498783, 17870966063289283,282553643923249045737, 13505171096689643652228930, 1951495960309987636340762968396]