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A243988 as a simple table

na(n)
01
12
25
310
421
542
685
7169
8333
9655
101286
112519
124935
139675
1418982
1537285
1673346
17144509
18285158
19563546
201115309
212210243
224385443
238710876
2417319387
2534464792
2668634821
27136771603
28272703704
29543995341
301085620097
312167267262
324327886353
338644663133
3417270784312
3534510656589
3668969830833

[1,2,5,10,21,42,85,169,333,655,1286,2519,4935,
 9675,18982,37285,73346,144509,285158,563546,
 1115309,2210243,4385443,8710876,17319387,34464792,
 68634821,136771603,272703704,543995341,1085620097,
 2167267262,4327886353,8644663133,17270784312,
 34510656589,68969830833]