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A222808 as a simple table

na(n)
10
20
30
42
58
624
762
8150
9338
10738
111568
123282
136780
1413904
1528288
1657342
17115812
18233426
19469656
20944000
211895194
223802762
237625328
2415284798
2530626642
2661353084
27122872144
28246042562
29492592948
30986089652
311973756116
323950330140
337905541650
3415819942048
3531655323370

[0,0,0,2,8,24,62,150,338,738,1568,3282,6780,13904,
 28288,57342,115812,233426,469656,944000,1895194,
 3802762,7625328,15284798,30626642,61353084,
 122872144,246042562,492592948,986089652,
 1973756116,3950330140,7905541650,15819942048,
 31655323370]