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A133953 as a simple table

na(n)
12
26
312
424
550
6110
7252
8592
91410
103382
118140
1219624
1347346
14114270
15275836
16665888
171607554
183880934
199369356
2022619576
2154608434
22131836366
23318281084
24768398448
251855077890
264478554134
2710812186060
2826102926152
2963018038258

[2,6,12,24,50,110,252,592,1410,3382,8140,19624,
 47346,114270,275836,665888,1607554,3880934,
 9369356,22619576,54608434,131836366,318281084,
 768398448,1855077890,4478554134,10812186060,
 26102926152,63018038258]