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A261559 as a simple table

na(n)
12
28
328
4224
51232
64004
756056
8896896
98520512
1014910896
11328039712
1241004964
131066129064
1429851613792
15462700013776
161346036403712
174711127412992
1843577928570176
19127381637358976
20652830891464752
219139632480506528
22402143829142287232
239450379984843749952

[2,8,28,224,1232,4004,56056,896896,8520512,
 14910896,328039712,41004964,1066129064,
 29851613792,462700013776,1346036403712,
 4711127412992,43577928570176,127381637358976,
 652830891464752,9139632480506528,
 402143829142287232,9450379984843749952]