220120

Appears in sequences

• Fibonacci numbers written in base 4.at n=18A004687
• Array read by ascending antidiagonals: A(n, k) = n!*[x^(n-1)] Li(-k, 1 - exp(-4*x))/(4*x*cosh(x)), where Li(n, z) is the polylogarithm function.at n=40A345393