276160domain: NAppears in sequencesSum C(n-3k,3k+1), k=0..floor(n/6).at n=28A102516Number of (n+2) X (5+2) 0..3 arrays with every 3 X 3 subblock row and column sum equal to 0 2 3 6 or 7 and every 3 X 3 diagonal and antidiagonal sum not equal to 0 2 3 6 or 7.at n=11A252111Expansion of (1 + x)/(1 - x^3*(1 + x)^3).at n=28A375319