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A006481 as a simple table

na(n)
11
22
33
44
55
611
721
836
957
10127
11253
12463
13793
141717
153433
166436
1711441
1824311
1948621
2092379
21167961
22352717
23705433
241352079
252496145
265200301
2710400601
2820058301
2937442161

[1,2,3,4,5,11,21,36,57,127,253,463,793,1717,3433,
 6436,11441,24311,48621,92379,167961,352717,705433,
 1352079,2496145,5200301,10400601,20058301,
 37442161]