19 citations · 98 across the 36 of their papers we have counts for
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math.CO2016
A bijection for two sequences in OEIS
David Callan
We show that sequences A026737 and A111279 in The On-Line Encyclopedia of Integer Sequences are the same by giving a bijection between two classes of Grand Schroder paths.
math.CO2016
A note on a bijection for Schröder permutations
David Callan
There is a bijection from Schroder paths to {4132, 4231}-avoiding permutations due to Bandlow, Egge, and Killpatrick that sends "area" to "inversion number". Here we give a concise…
math.CO2016
Five subsets of permutations enumerated as weak sorting permutations
David Callan, Toufik Mansour
We show that the number of members of S_n avoiding any one of five specific triples of 4-letter patterns is given by sequence A111279 in OEIS, which is known to count weak sorting…