A080318 - OEIS

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A080318 as a simple table

n	a(n)
0	2
1	56
2	16256
3	4186496
4	274374557696
5	70239893062016
6	4603241631720636416
7	301678043576445270327296
8	1295697331082095312130350876983296
9	331698516757016399905370236824584576

[2,56,16256,4186496,274374557696,70239893062016, 4603241631720636416,301678043576445270327296, 1295697331082095312130350876983296, 331698516757016399905370236824584576]