53517

Appears in sequences

• Number of n X n binary matrices, symmetric about both diagonal and antidiagonal, with no more than 1 one in any 2 X 2 subblock.at n=11A141485
• Number of ways of placing kings with no more than 1 mutual attack on an n X n chessboard symmetric about both diagonal and antidiagonal.at n=11A143873
• Number of n X n binary arrays with all ones connected only in a 1001-1111 pattern in any orientation.at n=7A146618
• Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1001-1111 pattern in any orientation.at n=16A146620
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, -1, 0), (-1, 0, 1), (0, 1, -1), (1, 0, 0)}.at n=12A148078
• Numbers that are palindromic in base i-1.at n=23A342725