507689

Appears in sequences

• Tetranacci numbers: a(n) = a(n-1) + a(n-2) + a(n-3) + a(n-4), with initial conditions a(0..3) = (0, 0, 1, 0).at n=24A001631
• Number of palindromic binary strings of length n having no 4-runs of 1's.at n=39A382478