A156213 - OEIS

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A156213 as a simple table

n	a(n)
0	1
1	2
2	26
3	1756
4	577190
5	846763548
6	5293107304932
7	138013765804872888
8	14838375909837963204230
9	6530915607537754235471687212
10	11710315776946229385945240614099084

[1,2,26,1756,577190,846763548,5293107304932, 138013765804872888,14838375909837963204230, 6530915607537754235471687212, 11710315776946229385945240614099084]