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A048121 as a simple table

na(n)
10
20
31
43
512
642
7156
8570
92124
107926
1129844
12112812
13428712
141635108
156259236
1624031260
1792517180
18357019224
191380671532
205349496152
2120762603724
2280709201504
23314178212928
241224576411084
254778651920092
2618667769062044

[0,0,1,3,12,42,156,570,2124,7926,29844,112812,
 428712,1635108,6259236,24031260,92517180,
 357019224,1380671532,5349496152,20762603724,
 80709201504,314178212928,1224576411084,
 4778651920092,18667769062044]