778070domain: NAppears in sequencesNumbers k such that (3^k - 7)/2 is prime.at n=26A063679Eight bishops and one elephant on a 3 X 3 chessboard: a(n) = 3*2^n - 2*F(n+1), with F(n) = A000045(n).at n=18A175657Number of length-4 0..n arrays with no following elements greater than or equal to the first repeated value.at n=28A267233