Number of length n+2 0..4 arrays with some pair in every consecutive three terms totalling exactly 4.

A245865

Number of length n+2 0..4 arrays with some pair in every consecutive three terms totalling exactly 4.

Terms

    a(0) =61a(1) =193a(2) =549a(3) =1629a(4) =4753a(5) =13961a(6) =40901a(7) =119953a(8) =351649a(9) =1031057a(10) =3022933a(11) =8863117a(12) =25986061a(13) =76189749a(14) =223384017a(15) =654949861a(16) =1920277409a(17) =5630150189a(18) =16507298221a(19) =48398515249a(20) =141901859897a(21) =416048676085

External references