OFFSET
2,2
COMMENTS
Remmel (2014) asks for a formula.
LINKS
Jeffrey B. Remmel, Consecutive Up-down Patterns in Up-down Permutations, Electron. J. Combin., 21 (2014), #P3.2.
CROSSREFS
KEYWORD
sign,more
AUTHOR
N. J. A. Sloane, Jul 12 2014
STATUS
approved