76686domain: NAppears in sequencesNumber of compositions (ordered partitions) of n whereby at most 1 increase is allowed and this increase must be by 1.at n=30A090752a(n) = Pell(n+2) - 2^n.at n=12A094723Number of (w,x,y,z) with all terms in {1,...,n} and 2*w*x>=3*y*z.at n=21A211923