Number of 0..3 arrays x(0..n+1) of n+2 elements without any two consecutive increases or two consecutive decreases.

A200833

Number of 0..3 arrays x(0..n+1) of n+2 elements without any two consecutive increases or two consecutive decreases.

Terms

    a(0) =56a(1) =194a(2) =676a(3) =2356a(4) =8210a(5) =28610a(6) =99700a(7) =347434a(8) =1210736a(9) =4219166a(10) =14702926a(11) =51236674a(12) =178549274a(13) =622207508a(14) =2168265232a(15) =7555958512a(16) =26330961818a(17) =91757987972a(18) =319757721532

External references