login

A249715 as a simple table

na(n)
10
24
36
413
515
627
747
855
9111
10223
11447
12895
131791
143583
157167
1614335
1728671
1857343
19114687
20229375
21458751
22917503
231835007
243670015
257340031
2614680063
2729360127
2858720255
29117440511

[0,4,6,13,15,27,47,55,111,223,447,895,1791,3583,
 7167,14335,28671,57343,114687,229375,458751,
 917503,1835007,3670015,7340031,14680063,29360127,
 58720255,117440511]