



0, 1, 1, 1, 2, 3, 3, 4, 4, 4, 5, 5, 5, 6, 7, 7, 8, 9, 9, 10, 10, 10, 11, 12, 12, 13, 13, 13, 14, 14, 14, 15, 16, 16, 17, 17, 17, 18, 18, 18, 19, 20, 20, 21, 22, 22, 23, 23, 23, 24, 25, 25, 26, 27, 27, 28, 28, 28, 29, 30, 30, 31, 31, 31, 32, 32, 32, 33, 34, 34, 35, 36, 36, 37, 37, 37, 38, 39, 39, 40
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OFFSET

1,5


COMMENTS

Almost identical to A189641.


LINKS

Table of n, a(n) for n=1..80.


FORMULA

s(n)=[(n+1)/3]+s([n/3]), where s(0)=0.


MATHEMATICA

t = Nest[Flatten[# /. {0>{0, 1, 0}, 1>{0, 1, 1}}] &, {0}, 5] (*A080846*)
f[n_] := t[[n]]
Flatten[Position[t, 0]] (* A026225 conjectured *)
Flatten[Position[t, 1]] (* A026179 conjectured *)
s[n_] := Sum[f[i], {i, 1, n}]; s[0] = 0;
Table[s[n], {n, 1, 120}] (*A189672*)


CROSSREFS

Cf. A080846, A026225, A026179.
Sequence in context: A196376 A156077 A189641 * A058889 A226143 A166724
Adjacent sequences: A189669 A189670 A189671 * A189673 A189674 A189675


KEYWORD

nonn


AUTHOR

Clark Kimberling, Apr 25 2011


STATUS

approved



