51266domain: NAppears in sequencesNumber of nondecreasing arrangements of n+2 numbers in 0..4 with each number being the sum mod 5 of two others.at n=28A183907Binomial(n,4) - A290447(n).at n=50A290461a(n) = A006561(n) - A290447(n).at n=50A290465