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A072641 as a simple table

na(n)
00
11
22
34
47
512
622
742
883
9164
10326
11651
121301
132601
145201
1510400
1620798
1741594
1883187
19166373
20332744
21665487
221330972
232661943
245323885
2510647769
2621295536
2742591070
2885182139
29170364276
30340728551
31681457100

[0,1,2,4,7,12,22,42,83,164,326,651,1301,2601,5201,
 10400,20798,41594,83187,166373,332744,665487,
 1330972,2661943,5323885,10647769,21295536,
 42591070,85182139,170364276,340728551,681457100]