12745506816domain: NAppears in sequencesDeterminant of the 2*n X 2*n matrix with (i,j)-entry equal to 1 or 0 according as i + j is a prime congruent to 1 mod 4 or not.at n=27A228574Number of (n+1)X(3+1) 0..2 arrays with nondecreasing sum of every two consecutive values in every row and column.at n=10A250438