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A275556 as a simple table

na(n)
01
11
22
33
413
545
6412
74375
866988
91199038
1025033020
11589567451
1215480284910
13448042511917
1414173510363424
15486548852524671
1618014399792942108
17715605766365332673
1830359882832309625502
191370096714607544395379
2065536000002956800104588

[1,1,2,3,13,45,412,4375,66988,1199038,25033020,
 589567451,15480284910,448042511917,14173510363424,
 486548852524671,18014399792942108,
 715605766365332673,30359882832309625502,
 1370096714607544395379,65536000002956800104588]