445923domain: NAppears in sequencesNumber of (4+2) X (n+2) 0..3 arrays with every 3 X 3 subblock row and diagonal sum equal to 0 3 5 6 or 7 and every 3 X 3 column and antidiagonal sum not equal to 0 3 5 6 or 7.at n=23A252388Numbers k such that k, k+2, k+4 are of the form p^2*q where p and q are distinct primes.at n=26A308735