235164domain: NAppears in sequencesDenominators of continued fraction convergents to sqrt(522).at n=12A041999Number of (1+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 2 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 2 3 4 6 or 7.at n=12A252408