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A115112 as a simple table

na(n)
10
24
318
468
5250
6922
73430
812868
948618
10184754
11705430
122704154
1310400598
1440116598
15155117518
16601080388
172333606218
189075135298
1935345263798
20137846528818
21538257874438
222104098963718
238233430727598
2432247603683098

[0,4,18,68,250,922,3430,12868,48618,184754,705430,
 2704154,10400598,40116598,155117518,601080388,
 2333606218,9075135298,35345263798,137846528818,
 538257874438,2104098963718,8233430727598,
 32247603683098]