13307904

Appears in sequences

• 1/9 of the number of 9-colorings of an n X n array symmetric about both diagonal and antidiagonal.at n=4A145259
• a(n) = ((4+sqrt(5))*(1+sqrt(5))^n + (4-sqrt(5))*(1-sqrt(5))^n)/2.at n=13A163069
• Lexicographically first sequence of positive squares, no two or more of which sum to a square.at n=17A305884