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A049890 as a simple table

na(n)
11
21
32
43
56
612
724
847
993
10188
11376
12751
131501
142999
155992
1611972
1723921
1847888
1995776
20191551
21383101
22766199
231532392
243064772
256129521
2612258996
2724517897
2849035606
2998070837
30196140924
31392280350
32784557707
331569109434

[1,1,2,3,6,12,24,47,93,188,376,751,1501,2999,5992,
 11972,23921,47888,95776,191551,383101,766199,
 1532392,3064772,6129521,12258996,24517897,
 49035606,98070837,196140924,392280350,784557707,
 1569109434]