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A003776 as a simple table

na(n)
13
254
31140
424360
5521064
611146656
7238452456
85101047216
9109123156248
102334395822496
1149938107061384
121068291209653392
1322853211220567416
14488882861126970624

[3,54,1140,24360,521064,11146656,238452456,
 5101047216,109123156248,2334395822496,
 49938107061384,1068291209653392,22853211220567416,
 488882861126970624]