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A280139 as a simple table

na(n)
01
12
22
312
47
562
62
7252
815
91016
1015
114094
1218
1316364
1447
1565514
16160
17262047
18240
191048479
20496
214194271
2288
2316777119
24510
2567108610
262044
27268434959
28920
291073737727
3012046
314294953978
3264008
3317179847063
3436852
3568719442583
3692902
37274877802686

[1,2,2,12,7,62,2,252,15,1016,15,4094,18,16364,47,
 65514,160,262047,240,1048479,496,4194271,88,
 16777119,510,67108610,2044,268434959,920,
 1073737727,12046,4294953978,64008,17179847063,
 36852,68719442583,92902,274877802686]