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A281676 as a simple table

na(n)
01
12
23
312
47
560
61
7246
823
9992
1059
114072
123
1316300
14135
1565320
16323
17261676
18839
191048104
20323
214192812
222503
2316774504
244227
2567102060
2610471
27268420392
2826691
291073726892
3010439
314294920040
3277059
3317179771020
34158071
3568719265360
36339723

[1,2,3,12,7,60,1,246,23,992,59,4072,3,16300,135,
 65320,323,261676,839,1048104,323,4192812,2503,
 16774504,4227,67102060,10471,268420392,26691,
 1073726892,10439,4294920040,77059,17179771020,
 158071,68719265360,339723]