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A111538 as a simple table

na(n)
01
13
214
384
4600
54908
644952
7454344
85016768
960062352
10775089312
1110728930912
12158638465536
132496437377728
1441674737264000
15735831528563328
1613704461848753152
17268562085051533568
185525005742876244480

[1,3,14,84,600,4908,44952,454344,5016768,60062352,
 775089312,10728930912,158638465536,2496437377728,
 41674737264000,735831528563328,13704461848753152,
 268562085051533568,5525005742876244480]