99879234domain: NAppears in sequencesNumber of compositions of 5*n-3 into parts 2 and 5.at n=18A369843Expansion of (1 + x)/(1 - x^2*(1 + x)^3).at n=30A375315a(n) = Sum_{k=0..floor(2*n/5)} binomial(2*n-3*k,2*k).at n=23A391541