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A027557 as a simple table

na(n)
01
12
24
38
414
526
644
778
8130
9224
10370
11626
121028
131718
142810
154656
167594
1712506
1820356
1933374
2054242
2188640
22143906
23234594
24380548
25619238
261003882
271631312
282643386
294291082
306950852
3111274702
3218258322
3329598560

[1,2,4,8,14,26,44,78,130,224,370,626,1028,1718,
 2810,4656,7594,12506,20356,33374,54242,88640,
 143906,234594,380548,619238,1003882,1631312,
 2643386,4291082,6950852,11274702,18258322,
 29598560]