55676

Appears in sequences

• Numbers n such that phi(4n+1) = sigma(n).at n=15A067234
• a(0) = 1, a(1) = 1 and for n >= 2, a(n) = floor(4 * a(n-2) * a(n-1) / (a(n-2) + a(n-1))).at n=26A093335
• Triangle T(n, k) = binomial(2*n, n) + binomial(n, k)^2, read by rows.at n=48A157531
• Triangle T(n, k) = binomial(2*n, n) + binomial(n, k)^2, read by rows.at n=51A157531
• Number of 3Xn integer arrays with each element equal to the number of horizontal and antidiagonal neighbors equal to itself.at n=21A266013