132259domain: NAppears in sequencesDenominators of continued fraction convergents to sqrt(274).at n=12A041515Number of (1+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 1 2 5 6 or 7 and every 3X3 column and antidiagonal sum not equal to 1 2 5 6 or 7.at n=10A252575