728295

Appears in sequences

• 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=12A222309
• Number of length n words on {1,2,3} with no more than one consecutive 1 and no more than two consecutive 2's and no more than three consecutive 3's.at n=14A242452