59451

Appears in sequences

• Number of 0..n arrays of length 6 with each element differing from at least one neighbor by 1 or less.at n=11A221598
• a(n) is the number of 2 X 2 matrices with elements 1..n where at least one row, at least one column and at least one of the two diagonals is strictly increasing.at n=19A391092