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A134401 as a simple table

na(n)
01
12
28
324
464
5160
6384
7896
82048
94608
1010240
1122528
1249152
13106496
14229376
15491520
161048576
172228224
184718592
199961472
2020971520
2144040192
2292274688
23192937984
24402653184
25838860800
261744830464
273623878656
287516192768

[1,2,8,24,64,160,384,896,2048,4608,10240,22528,
 49152,106496,229376,491520,1048576,2228224,
 4718592,9961472,20971520,44040192,92274688,
 192937984,402653184,838860800,1744830464,
 3623878656,7516192768]