A225157 - OEIS

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A225157 as a simple table

n	a(n)
1	1
2	4
3	21
4	541
5	345181
6	136901485261
7	21135572172649245550621
8	496712610012943408146407697714437299262548141
9	271328559212953102170688304392824035451911661168940831351173011072850527195615099225368381

[1,4,21,541,345181,136901485261, 21135572172649245550621, 496712610012943408146407697714437299262548141, 27132855921295310217068830439282403545191166116894\ 0831351173011072850527195615099225368381]