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A164047 as a simple table

na(n)
11
21
32
43
56
610
720
837
973
10139
11275
12533
131059
142075
154126
168134
1716194
1832058
1963910
20126932
21253252
22503933
231006056
242004838
254004124
267987149
2715957964
2831854676
2963660327
30127141415
31254136782
32507750109
331015059238
342028564292
354055812657
368107052520

[1,1,2,3,6,10,20,37,73,139,275,533,1059,2075,4126,
 8134,16194,32058,63910,126932,253252,503933,
 1006056,2004838,4004124,7987149,15957964,31854676,
 63660327,127141415,254136782,507750109,1015059238,
 2028564292,4055812657,8107052520]