61452domain: NAppears in sequencesG.f.: (1+x+x^2+x^3)/(1-3*x-3*x^2-3*x^3).at n=8A188714Array T(n,k): The number of words of length n in an alphabet of size k which do not contain 4 consecutive letters.at n=58A265624Numbers m that divide Sum_{k=1..m} binomial(m,k) mod k.at n=9A280559a(n) = 30*2^n + 12.at n=11A305153