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A247840 as a simple table

na(n)
10
236
3252
41548
59324
655980
7335916
82015532
912093228
1072559404
11435356460
122612138796
1315672832812
1494036996908
15564221981484
163385331888940
1720311991333676
18121871948002092
19731231688012588
204387390128075564
2126324340768453420

[0,36,252,1548,9324,55980,335916,2015532,12093228,
 72559404,435356460,2612138796,15672832812,
 94036996908,564221981484,3385331888940,
 20311991333676,121871948002092,731231688012588,
 4387390128075564,26324340768453420]