A077329 - OEIS

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A077329 as a simple table

n	a(n)
1	4
2	40
3	42
4	420
5	4290
6	43890
7	4001970
8	40029990
9	406816410
10	40026056070
11	401120980260
12	40013061952710
13	405332750552730
14	40111962162442170
15	4000228915204892370
16	40909794684132183810
17	4000669166940700163910

[4,40,42,420,4290,43890,4001970,40029990, 406816410,40026056070,401120980260,40013061952710, 405332750552730,40111962162442170, 4000228915204892370,40909794684132183810, 4000669166940700163910]