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A284885
(A284883)/2.
4
2, 3, 5, 6, 7, 8, 11, 12, 14, 15, 16, 17, 20, 21, 22, 23, 26, 27, 29, 30, 32, 33, 34, 35, 38, 39, 41, 42, 43, 44, 47, 48, 49, 50, 53, 54, 56, 57, 59, 60, 61, 62, 65, 66, 67, 68, 71, 72, 74, 75, 77, 78, 79, 80, 83, 84, 86, 87, 88, 89, 92, 93, 95, 96, 97, 98
OFFSET
1,1
LINKS
MATHEMATICA
s = Nest[Flatten[# /. {0 -> {0, 1}, 1 -> {0, 1, 1, 0}}] &, {0}, 6] (* A284878 *)
d = Differences[s] (* A284881 *)
d2 = Flatten[Position[d, 0]] (* A284883 *)
d2/2 (* A284885 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, Apr 16 2017
STATUS
approved