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A253892 as a simple table

na(n)
00
11
27
33
430
563
64
72
88191
957
10510
1111
12511
1310
1431
156
16524286
1736893488147419103231
18131068
1965532
201073741823
2116381
228190
23262143
24508
25248
2665535
27125
2816
2960
30127
3115
324194299
33633825300114114700748351602685
342097134
35200867255532373784442745261542645325315275374222849104412671
3610141204801825835211973625643007
37442
38268435451
3932754
40190

[0,1,7,3,30,63,4,2,8191,57,510,11,511,10,31,6,
 524286,36893488147419103231,131068,65532,
 1073741823,16381,8190,262143,508,248,65535,125,16,
 60,127,15,4194299,633825300114114700748351602685,
 2097134,
 20086725553237378444274526154264532531527537422284\
 9104412671,10141204801825835211973625643007,442,
 268435451,32754,190]