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A081358 as a simple table

na(n)
00
11
22
38
432
5184
61104
78448
867584
9648576
106485760
1174972160
12899665920
1312174658560
14170445219840
152643856588800
1642301705420800
17740051782041600
1813320932076748800
19259500083163955200
205190001663279104000
21111422936937037824000
222451304612614832128000

[0,1,2,8,32,184,1104,8448,67584,648576,6485760,
 74972160,899665920,12174658560,170445219840,
 2643856588800,42301705420800,740051782041600,
 13320932076748800,259500083163955200,
 5190001663279104000,111422936937037824000,
 2451304612614832128000]