1062950domain: NAppears in sequencesNumber of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 3 5 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 0 3 5 6 or 7.at n=17A252142Expansion of Product_{k>=1} (1 + x^k)^(k*(k+1)*(2*k+1)/6).at n=14A281156