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A063823 as a simple table

na(n)
01
12
22
32
44
56
610
720
838
974
10148
11294
12586
131172
142342
154682
169364
1718726
1837450
1974900
20149798
21299594
22599188
231198374
242396746
254793492
269586982
2719173962
2838347924
2976695846
30153391690
31306783380
32613566758
331227133514
342454267028
354908534054
369817068106

[1,2,2,2,4,6,10,20,38,74,148,294,586,1172,2342,
 4682,9364,18726,37450,74900,149798,299594,599188,
 1198374,2396746,4793492,9586982,19173962,38347924,
 76695846,153391690,306783380,613566758,1227133514,
 2454267028,4908534054,9817068106]