A329360 The decimal expansion of a(n) is the first n terms of A000002.

0, 1, 12, 122, 1221, 12211, 122112, 1221121, 12211212, 122112122, 1221121221, 12211212212, 122112122122, 1221121221221, 12211212212211, 122112122122112, 1221121221221121, 12211212212211211, 122112122122112112, 1221121221221121122, 12211212212211211221

Offset

0,3

Links

Table of n, a(n) for n=0..20.

Mathematica

kolagrow[q_]:=If[Length[q]<2, Take[{1, 2}, Length[q]+1], Append[q, Switch[{q[[Length[Split[q]]]], q[[-2]], Last[q]}, {1, 1, 1}, 0, {1, 1, 2}, 1, {1, 2, 1}, 2, {1, 2, 2}, 0, {2, 1, 1}, 2, {2, 1, 2}, 2, {2, 2, 1}, 1, {2, 2, 2}, 1]]]
kol[n_Integer]:=If[n==0, {}, Nest[kolagrow, {1}, n-1]];
Table[FromDigits[kol[n]], {n, 0, 30}]

Crossrefs

Cf. A000002, A054353, A088568, A288605, A296658, A329315, A329316, A329355, A329356, A329361, A329362.

Sequence in context: A358615 A231869 A038490 * A037551 A134584 A090843

Adjacent sequences: A329357 A329358 A329359 * A329361 A329362 A329363

Keyword

nonn,base

Author

Gus Wiseman, Nov 12 2019

Status

approved