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A137916 as a simple table

na(n)
01
10
20
31
415
5222
63670
768820
81456875
934506640
10906073524
1126154657270
12823808845585
1328129686128940
141035350305641990
1540871383866109888
161722832666898627865
1777242791668604946560
183670690919234354407000
19184312149879830557190940
209751080154504005703189791

[1,0,0,1,15,222,3670,68820,1456875,34506640,
 906073524,26154657270,823808845585,28129686128940,
 1035350305641990,40871383866109888,
 1722832666898627865,77242791668604946560,
 3670690919234354407000,184312149879830557190940,
 9751080154504005703189791]