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A138860 as a simple table

na(n)
01
11
24
331
4364
55766
6115300
72788724
879197040
92583928360
1095256535936
113916137470664
12177651980724160
138815348234689920
14474993826614917632
1527619367979975064576
161723821221240101984000
17114948301218300412117632

[1,1,4,31,364,5766,115300,2788724,79197040,
 2583928360,95256535936,3916137470664,
 177651980724160,8815348234689920,
 474993826614917632,27619367979975064576,
 1723821221240101984000,114948301218300412117632]