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A256806 as a simple table

na(n)
1641
24219
328655
4187203
51226781
68090191
753254665
8350253925
92304752967
1015167443677
1199803396861
12656712280793
134321347940353
1428435562985711
15187111644664607
161231234858650427
178101804934566085
1853311657284829409

[641,4219,28655,187203,1226781,8090191,53254665,
 350253925,2304752967,15167443677,99803396861,
 656712280793,4321347940353,28435562985711,
 187111644664607,1231234858650427,8101804934566085,
 53311657284829409]