Number of length-n 0..2 arrays with no repeated value differing from the previous repeated value by other than plus two, zero or minus 1.

A269613

Number of length-n 0..2 arrays with no repeated value differing from the previous repeated value by other than plus two, zero or minus 1.

Terms

    a(0) =3a(1) =9a(2) =27a(3) =78a(4) =222a(5) =624a(6) =1740a(7) =4824a(8) =13320a(9) =36672a(10) =100752a(11) =276384a(12) =757344a(13) =2073600a(14) =5674176a(15) =15520128a(16) =42437760a(17) =116014080a(18) =317100288a(19) =866621952a(20) =2368230912a(21) =6471278592a(22) =17682164736a(23) =48313178112a(24) =132003268608a(25) =360658059264

External references