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A136794 as a simple table

na(n)
12
28
352
4376
52998
625256
7222128
82013680
918691522
10176743160
111696546848
1216488151400
13161919802562
141604274741608
1516016845623764
16160977882238968
171627406260427490
1816537733701226936

[2,8,52,376,2998,25256,222128,2013680,18691522,
 176743160,1696546848,16488151400,161919802562,
 1604274741608,16016845623764,160977882238968,
 1627406260427490,16537733701226936]