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A056469 as a simple table

na(n)
02
13
24
36
410
518
634
766
8130
9258
10514
111026
122050
134098
148194
1516386
1632770
1765538
18131074
19262146
20524290
211048578
222097154
234194306
248388610
2516777218
2633554434
2767108866
28134217730
29268435458
30536870914
311073741826
322147483650

[2,3,4,6,10,18,34,66,130,258,514,1026,2050,4098,
 8194,16386,32770,65538,131074,262146,524290,
 1048578,2097154,4194306,8388610,16777218,33554434,
 67108866,134217730,268435458,536870914,1073741826,
 2147483650]