123210

Appears in sequences

• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 78.at n=8A031756
• Catalan paths: numbers starting with 1 and ending with 0 where each digit is nonnegative and adjacent digits differ by 1.at n=7A079214
• a(n) = 81*n^2 + 9.at n=38A157888
• Number of nX3 0..1 arrays with every element unequal to 1, 2, 3 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=9A318425