27770

Appears in sequences

• Number of ways to place a non-attacking white and black pawn on n X n chessboard.at n=13A035290
• Number of Dyck n-paths starting U^mD^m (an m-pyramid), followed by a pyramid-free Dyck path.at n=12A035929
• Numbers n such that sigma(n)=2n-phi(phi(n)).at n=18A110073
• Numbers k such that k and k^2 use only the digits 0, 1, 2, 7 and 9.at n=30A136833
• 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, 1), (0, 0, -1), (0, 0, 1), (1, 0, -1)}.at n=10A148579
• a(n) = sum of minimal runlengths of all the partitions of n.at n=37A364808
• a(n) = sum of the side lengths of the minimum containing squares of all partitions of n.at n=26A368985