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A001973 as a simple table

na(n)
01
11
23
35
48
512
618
724
833
943
1055
1169
1286
13104
14126
15150
16177
17207
18241
19277
20318
21362
22410
23462
24519
25579
26645
27715
28790
29870
30956
311046
321143
331245
341353
351467
361588
371714
381848
391988

[1,1,3,5,8,12,18,24,33,43,55,69,86,104,126,150,
 177,207,241,277,318,362,410,462,519,579,645,715,
 790,870,956,1046,1143,1245,1353,1467,1588,1714,
 1848,1988]