OFFSET
1,5
REFERENCES
Paul J. Campbell, Circular permutations with exactly one modular run (3-sequence), submitted to Journal of Integer Sequences
LINKS
Wayne M. Dymáček and Isaac Lambert, Circular permutations avoiding runs of i, i+1, i+2 or i, i-1, i-2, Journal of Integer Sequences, Vol. 14 (2011) Article 11.1.6.
FORMULA
a(n) = 2*A235937(n).
EXAMPLE
With specified sequence 123:
a(5) = 2: 12354, 32154.
a(6) = 4: 123564, 321564, 123645, 321546.
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul J. Campbell, Jan 20 2014, with Joe Marasco and Ashish Vikram
EXTENSIONS
a(20)-a(21) from Alois P. Heinz, Jan 24 2014
Obsolete b-file deleted by N. J. A. Sloane, Jan 05 2019
STATUS
approved