262260

Appears in sequences

• Number of 4 X n 0-1 matrices avoiding simultaneously the right angled numbered polyomino patterns (ranpp) (00;1), (01;0), (10;0) and (01;1).at n=18A100316
• Number of permutations of 1..n+4 with the number moved left exceeding the number moved right by n.at n=13A179571
• Let P be a one-move "rider" with move set M={(1,2)}; a(n) is the number of non-attacking positions of three indistinguishable pieces P on an n X n board.at n=10A222309