122093

Appears in sequences

• E.g.f.: arctan(sec(x)*log(x+1)) = x - 1/2!*x^2 + 3/3!*x^3 - 37/5!*x^5 + 345/6!*x^6 - ...at n=9A012775
• G.f.: 1/(1 -2 x^3 - x^4 + x^5).at n=46A122518
• Number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having two or four distinct values, and new values 0..3 introduced in row major order.at n=2A210117
• Number of (n+1)X4 0..3 arrays with every 2X2 subblock having two or four distinct values, and new values 0..3 introduced in row major order.at n=2A210120
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock having two or four distinct values, and new values 0..3 introduced in row major order.at n=12A210125