A222778 - OEIS

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A222778 as a simple table

n	a(n)
1	3
2	34
3	969
4	64752
5	5227536
6	436214328
7	36601614264
8	3073970725512
9	258205634457816
10	21689162608860168
11	1821888109561493784
12	153038579509053600072
13	12855240375043076417496
14	1079840187251574876131208

[3,34,969,64752,5227536,436214328,36601614264, 3073970725512,258205634457816,21689162608860168, 1821888109561493784,153038579509053600072, 12855240375043076417496,1079840187251574876131208]