login

A280293 as a simple table

na(n)
03
11
26
37
418
531
666
7127
8258
9511
101026
112047
124098
138191
1416386
1532767
1665538
17131071
18262146
19524287
201048578
212097151
224194306
238388607
2416777218
2533554431
2667108866
27134217727
28268435458
29536870911
301073741826
312147483647
324294967298
338589934591

[3,1,6,7,18,31,66,127,258,511,1026,2047,4098,8191,
 16386,32767,65538,131071,262146,524287,1048578,
 2097151,4194306,8388607,16777218,33554431,
 67108866,134217727,268435458,536870911,1073741826,
 2147483647,4294967298,8589934591]