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A176503 as a simple table

na(n)
11
21
31
42
54
68
715
829
957
10112
11220
12432
13848
141666
153273
166430
1712632
1824816
1948754
2095783
21188177
22369696
23726312
241426930
252803381
265507590
2710820345
2821257915
2941763825
3082050242
31161197933
32316693445
33622183778
341222357651
352401474098
364717995460

[1,1,1,2,4,8,15,29,57,112,220,432,848,1666,3273,
 6430,12632,24816,48754,95783,188177,369696,726312,
 1426930,2803381,5507590,10820345,21257915,
 41763825,82050242,161197933,316693445,622183778,
 1222357651,2401474098,4717995460]