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A099503 as a simple table

na(n)
01
14
216
363
4248
5976
63841
715116
859488
9234111
10921328
113625824
1214269185
1356155412
14220995824
15869714111
163422701032
1713469808304
1853009519105
19208615375388
20820991693248
213230957253887
2212715213640160
2350039862867392

[1,4,16,63,248,976,3841,15116,59488,234111,921328,
 3625824,14269185,56155412,220995824,869714111,
 3422701032,13469808304,53009519105,208615375388,
 820991693248,3230957253887,12715213640160,
 50039862867392]