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A093977 as a simple table

na(n)
10
20
30
40
54
6155
72326
829327
9334720
103580023
1136721672
12366906343
133604148124
1434997285167
15337195587089
163231721755068
1730863065190469
18294053775100845

[0,0,0,0,4,155,2326,29327,334720,3580023,36721672,
 366906343,3604148124,34997285167,337195587089,
 3231721755068,30863065190469,294053775100845]