1609945658

Appears in sequences

• a(n) = 2*a(n-1) + 5*a(n-2) + 2*a(n-3).at n=17A101604
• Number of n X 2 0..2 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero.at n=18A230269