OFFSET
0,3
COMMENTS
"beth" should be written as the Hebrew letter of that name.
LINKS
Marilena Barnabei, Flavio Bonetti, Niccolò Castronuovo, Matteo Silimbani, Permutations avoiding a simsun pattern, The Electronic Journal of Combinatorics (2020) Vol. 27, Issue 3, P3.45.
FORMULA
See Barnabei et al. (2020), Th. 2, for a recurrence.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Dec 01 2020.
STATUS
approved