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A064644 as a simple table

na(n)
01
12
21
31
45
56
622
721
813
91
101
1145
1284
13104
14105
15631
16630
17562
18412
19211
201
211
221263
232500
243558
254285
264602
274603
2839469
2939468
3037573
3133180
3226560
3318305
349207
351
361
3778939
38157243
39230496
40293794
41342944
42375058
43388869
44388870
454327322

[1,2,1,1,5,6,22,21,13,1,1,45,84,104,105,631,630,
 562,412,211,1,1,1263,2500,3558,4285,4602,4603,
 39469,39468,37573,33180,26560,18305,9207,1,1,
 78939,157243,230496,293794,342944,375058,388869,
 388870,4327322]