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A055895 as a simple table

na(n)
01
12
26
310
422
534
678
7130
8278
9522
101062
112050
124190
138194
1416518
1532810
1665814
17131074
18262734
19524290
201049654
212097290
224196358
238388610
2416781662
2533554466
2667117062
27134218250
28268451990
29536870914
301073775726
312147483650
324295033110
338589936650

[1,2,6,10,22,34,78,130,278,522,1062,2050,4190,
 8194,16518,32810,65814,131074,262734,524290,
 1049654,2097290,4196358,8388610,16781662,33554466,
 67117062,134218250,268451990,536870914,1073775726,
 2147483650,4295033110,8589936650]