A162812 - OEIS

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A162812 as a simple table

n	a(n)
0	1
1	26
2	650
3	15925
4	390000
5	9547200
6	233715300
7	5721300000
8	140056207200
9	3428545582800
10	83930052960000
11	2054589502867200
12	50295905665012800
13	1231232868141120000
14	30140313720487027200
15	737828346427571692800

[1,26,650,15925,390000,9547200,233715300, 5721300000,140056207200,3428545582800, 83930052960000,2054589502867200,50295905665012800, 1231232868141120000,30140313720487027200, 737828346427571692800]