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A317192 A140100(n) - A140102(n). 2
0, 1, 0, 1, 1, 2, 1, 2, 3, 2, 3, 3, 4, 3, 4, 3, 4, 4, 5, 4, 5, 6, 5, 6, 6, 7, 6, 7, 7, 8, 7, 8, 9, 8, 9, 9, 10, 9, 10, 9, 10, 10, 11, 10, 11, 12, 11, 12, 12, 13, 12, 13, 14, 13, 14, 14, 15, 14, 15, 14, 15, 15, 16, 15, 16, 17, 16, 17, 17 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

COMMENTS

It follows from known properties of A140100 and A140102 that the first differences of this sequence (see A317193) belong to {-1, 0, 1}.

Conjecture 1: a(n) = A276796(n) - A276797(n).

Conjecture 2: The first-difference sequence A317193 is an encoded form of the ternary tribonacci word A080843.

All these conjectures are now theorems - see the Dekking et al. paper. - N. J. A. Sloane, Jul 22 2019

LINKS

N. J. A. Sloane, Table of n, a(n) for n = 1..50000

F. Michel Dekking, Jeffrey Shallit, and N. J. A. Sloane, Queens in exile: non-attacking queens on infinite chess boards, Electronic J. Combin., 27:1 (2020), #P1.52.

CROSSREFS

Cf. A140100, A140101, A140102, A140103, A317193, A080843, A276796, A276797.

Sequence in context: A067731 A147844 A291985 * A053735 A033667 A033923

Adjacent sequences:  A317189 A317190 A317191 * A317193 A317194 A317195

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jul 31 2018

STATUS

approved

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Last modified August 6 18:25 EDT 2020. Contains 336256 sequences. (Running on oeis4.)