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A026770 as a simple table

na(n)
01
12
27
328
4120
5538
62493
711854
857558
9284392
101426038
117241356
1237173304
13192638992
141006564439
155297715628
1628061959428
17149491856978
18800425486692
194305263668514
2023251846197766
21126044501870378
22685569373724964
233740339567665558
2420463965229643218
25112250484320225118

[1,2,7,28,120,538,2493,11854,57558,284392,1426038,
 7241356,37173304,192638992,1006564439,5297715628,
 28061959428,149491856978,800425486692,
 4305263668514,23251846197766,126044501870378,
 685569373724964,3740339567665558,
 20463965229643218,112250484320225118]