1450540

Appears in sequences

• Number of -n..n arrays x(0..4) of 5 elements with zero sum, and adjacent elements not equal modulo three (with -1 modulo 3 = 2).at n=28A199912
• a(n) is the number of 2 X 2 matrices with elements 1..n where at least one row and at least one column is strictly increasing.at n=40A390922