1500183

Appears in sequences

• 1/4 the number of colorings of an n X n square array with 4 colors.at n=3A068254
• Number of n X 4 0..3 arrays with entries increasing mod 4 by 0, 1 or 2 rightwards and downwards, starting with upper left zero.at n=3A222440
• T(n,k) = number of n X k 0..3 arrays with entries increasing mod 4 by 0, 1 or 2 rightwards and downwards, starting with upper left zero.at n=24A222444