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A236140 as a simple table

na(n)
12976
279260
32113860
456388240
51503850638
640110759152
71069867016024
828536871273336
9761125924608458
1020300768006274458
11541469807189678490
1214442309765297348684
13385207864338207023016
1410274348880475607720026

[2976,79260,2113860,56388240,1503850638,
 40110759152,1069867016024,28536871273336,
 761125924608458,20300768006274458,
 541469807189678490,14442309765297348684,
 385207864338207023016,10274348880475607720026]