A077745 - OEIS

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A077745 as a simple table

n	a(n)
0	1
1	4
2	38
3	582
4	12354
5	335730
6	11127150
7	435300390
8	19633815810
9	1003121039970
10	57259773499950
11	3611583223860150
12	249441581246630850
13	18723487284033181650
14	1517668796159163197550
15	132117536404977132759750

[1,4,38,582,12354,335730,11127150,435300390, 19633815810,1003121039970,57259773499950, 3611583223860150,249441581246630850, 18723487284033181650,1517668796159163197550, 132117536404977132759750]