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A331237 as a simple table

na(n)
10
20
31
45
515
647
7127
8363
9978
102778
117624
1221566
1360584
14172221
15488978
161398457
174001323
1811490717
1933037548
2095195793
21274609124
22793298293
232294114542
246641070332
2519241453969
2655795142707
27161910611244

[0,0,1,5,15,47,127,363,978,2778,7624,21566,60584,
 172221,488978,1398457,4001323,11490717,33037548,
 95195793,274609124,793298293,2294114542,
 6641070332,19241453969,55795142707,161910611244]