Number of length-4 0..n arrays with no repeated value differing from the previous repeated value by other than plus two, zero or minus 1.

A269620

Number of length-4 0..n arrays with no repeated value differing from the previous repeated value by other than plus two, zero or minus 1.

Terms

    a(0) =15a(1) =78a(2) =249a(3) =612a(4) =1275a(5) =2370a(6) =4053a(7) =6504a(8) =9927a(9) =14550a(10) =20625a(11) =28428a(12) =38259a(13) =50442a(14) =65325a(15) =83280a(16) =104703a(17) =130014a(18) =159657a(19) =194100a(20) =233835a(21) =279378a(22) =331269a(23) =390072a(24) =456375a(25) =530790a(26) =613953a(27) =706524a(28) =809187a(29) =922650

External references