
7, 6, 7, 4, 7, 6, 7, 7, 6, 7, 4, 7, 6, 7, 6, 7, 4, 7, 6, 7, 7, 6, 7, 4, 7, 6, 7, 4, 7, 6, 7, 7, 6, 7, 4, 7, 6, 7, 6, 7, 4, 7, 6, 7, 7, 6, 7, 4, 7, 6, 7, 7, 6, 7, 4, 7, 6, 7, 6, 7, 4, 7, 6, 7, 7, 6, 7, 4, 7, 6, 7, 4, 7, 6, 7, 7, 6, 7, 4, 7, 6, 7, 6, 7, 4, 7, 6, 7, 7, 6, 7, 4, 7, 6, 7, 6, 7, 4, 7
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OFFSET

1,1


LINKS

Rémy Sigrist, Table of n, a(n) for n = 1..10608
Elena Barcucci, Luc Belanger and Srecko Brlek, On tribonacci sequences, Fib. Q., 42 (2004), 314320. See page 317.
F. Michel Dekking, Jeffrey Shallit, and N. J. A. Sloane, Queens in exile: nonattacking queens on infinite chess boards, arXiv:1907.09120, July 2019


FORMULA

a(n) = A003146(n+1)  A003146(n), for n >= 1.
a(n) = A276788(n) + A276789(n) + 1, for n >= 1.
a(n+1) = 7  t(n)*(t(n) + 1)/2, n >= 0, where t(n) = A080843(n).  Wolfdieter Lang, Dec 06 2018


CROSSREFS

Cf. A003144, A003145, A003146, A080843, A276788, A276789.
Sequence in context: A239341 A239606 A291423 * A188943 A093349 A309641
Adjacent sequences: A276789 A276790 A276791 * A276793 A276794 A276795


KEYWORD

nonn,easy


AUTHOR

N. J. A. Sloane, Oct 27 2016


STATUS

approved

