OFFSET
2,4
COMMENTS
REFERENCES
Douglas R. Hofstadter, Gödel, Escher, Bach: an Eternal Golden Braid, Basic Books, 1979, pp. 33-41 and pp. 261-262.
LINKS
Paolo Xausa, Table of n, a(n) for n = 2..10922 (rows 2..14 of the triangle, flattened).
Wikipedia, MU Puzzle.
EXAMPLE
Triangle begins:
[2] 1;
[3] 1 1 2;
[4] 1 1 2 1 2 2;
[5] 1 1 2 1 2 2 1 2 2 2 4;
[6] 1 1 2 1 2 2 1 2 2 2 4 1 2 2 2 4 2 4 4 4 5;
...
MATHEMATICA
A369179row[n_] := Select[Map[Count[#, 1]&, Tuples[{0, 1}, n - 1]], !Divisible[#, 3]&]; Array[A369179row, 6, 2]
CROSSREFS
KEYWORD
nonn,base,tabf,easy
AUTHOR
Paolo Xausa, Jan 16 2024
STATUS
approved