login
A291753
a(n) is the length of stage n in A137843.
2
1, 3, 6, 13, 27, 54, 109, 218, 437, 874, 1749, 3499, 6998, 13997, 27995, 55991, 111982, 223965, 447931, 895862, 1791725, 3583450, 7166901, 14333802, 28667605, 57335211, 114670422, 229340845, 458681691, 917363382, 1834726765, 3669453531, 7338907062, 14677814125, 29355628250, 58711256501, 117422513002, 234845026005
OFFSET
1,2
FORMULA
a(1) = 1; for n > 1, a(n) = 2*a(n-1) + (A137843(n-1) mod 2).
PROG
(Scheme) ;; Use the program given in A137843.
CROSSREFS
a(n) differs from similar A112306(n-1) for the first time at n=15, where a(15) = 27995, while A112306(14) = 27994.
Sequence in context: A123247 A212444 A112306 * A033129 A079403 A065830
KEYWORD
nonn
AUTHOR
Antti Karttunen, Aug 31 2017
STATUS
approved