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A278414 as a simple table

na(n)
10
20
30
41
520
61
715
8264
9264
1015
1190
122550
139354
142550
1590
16357
1722267
18201539
19201539
2022267
21357
221107
23166762
243576730
2511454780
263576730
27166762
281107
292907
301046418
3158069125
32514122657
33514122657
3458069125
351046418
362907
376765
385586207

[0,0,0,1,20,1,15,264,264,15,90,2550,9354,2550,90,
 357,22267,201539,201539,22267,357,1107,166762,
 3576730,11454780,3576730,166762,1107,2907,1046418,
 58069125,514122657,514122657,58069125,1046418,
 2907,6765,5586207]