A222720 - OEIS

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A222720 as a simple table

n	a(n)
1	6
2	666
3	88552
4	12956013
5	1928517786
6	289452236157
7	43727219083464
8	6642633038715993
9	1013931851324206903
10	155405622159690335817
11	23903771940011196629121
12	3688080815279058966399672

[6,666,88552,12956013,1928517786,289452236157, 43727219083464,6642633038715993, 1013931851324206903,155405622159690335817, 23903771940011196629121,3688080815279058966399672]