A217942 A217941(n)/2.
1, 3, 7, 16, 33, 70, 141, 287, 578, 1163, 2327, 4674, 9349, 18718, 37452, 74948, 149897, 299890, 599781, 1199724, 2399498, 4799278, 9598557, 19197792, 38395600, 76792313, 153584811, 307171904, 614343809, 1228692446, 2457384893, 4914778758, 9829558241, 19659134194, 39318268464
Offset: 1
Keywords
Crossrefs
A217941 is the main entry.