1211112

Appears in sequences

• Good's example of a "Standard List" of prime words over the alphabet {1,2}.at n=25A212659
• Number of n X n 0..2n-2 arrays with upper left zero and lower right 2n-2 and each element differing from its diagonal and antidiagonal neighbors by one or two.at n=3A265473
• Number of nX4 0..n+4-2 arrays with upper left zero and lower right n+4-2 and each element differing from its diagonal and antidiagonal neighbors by one or two.at n=3A265476
• T(n,k)=Number of nXk 0..n+k-2 arrays with upper left zero and lower right n+k-2 and each element differing from its diagonal and antidiagonal neighbors by one or two.at n=24A265480
• The Wythoff representation of n: an alternative way of presenting A189921.at n=37A317208