Showing math.COShow all
2 papers · 1 filter
math.CO2026
Pell-Padovan tetranacci numbers and their Hadamard product with classical sequences
Helmut Prodinger
A quick way to compute generating functions related to Pell-Padovan tetranacci numbers and classical sequences of recursions of order two is provided. Eight special instances can b…
math.CO2025
Cornerless, peakless, valleyless Motzkin paths (regular and skew) and applications to bargraphs
Helmut Prodinger
Motzkin paths consist of up-steps, down-steps, horizontal steps, never go below the -axis and return to the -axis. Versions where the return to the -axis isn't required ar…