1092626domain: NAppears in sequencesa(n) = Sum_{a(k): k=0,1,2,...,n-4,n-2,n-1}; a(n-3) is not a summand; initial terms are 1,1,3.at n=23A049866Number of nondecreasing arrangements of n+2 numbers in 0..7 with each number being the sum mod 8 of two others.at n=18A183910