140526

Appears in sequences

• Numbers k such that k and 4*k are anagrams.at n=32A023088
• Triangle T(n,k), read by rows n>=0 with terms k=1..3^n, where row n lists the coefficients in the n-th iteration of x*(1+x)^2.at n=28A166888
• a(n) = n*(n+1)*(6*n-5)/2.at n=36A172082
• Number of 0..n arrays of length 7 with each element differing from at least one neighbor by 1 or less, starting with 0.at n=30A221686