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A253946 as a simple table

na(n)
56
642
7168
8504
91260
102772
115544
1210296
1318018
1430030
1548048
1674256
17111384
18162792
19232560
20325584
21447678
22605682
23807576
241062600
251381380
261776060
272260440
282850120
293562650
304417686
315437152
326645408
338069424
349738960
3511686752
3613948704
3716564086

[6,42,168,504,1260,2772,5544,10296,18018,30030,
 48048,74256,111384,162792,232560,325584,447678,
 605682,807576,1062600,1381380,1776060,2260440,
 2850120,3562650,4417686,5437152,6645408,8069424,
 9738960,11686752,13948704,16564086]