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A278685 as a simple table

na(n)
10
20
31
476
53773
666201
7651193
84318451
921754341
1089267490
11312974387
12968069337
132704548145
146942663519
1516594368633
1637311795887
1779570707969
18162013125016
19316669793867
20596873304925
211089009784181
221929545889877
233329316638249
245607471933963
259238336533613

[0,0,1,76,3773,66201,651193,4318451,21754341,
 89267490,312974387,968069337,2704548145,
 6942663519,16594368633,37311795887,79570707969,
 162013125016,316669793867,596873304925,
 1089009784181,1929545889877,3329316638249,
 5607471933963,9238336533613]