Number of -6..6 arrays x(0..n-1) of n elements with zero sum, and adjacent elements not both strictly positive and not both strictly negative.

A199896

Number of -6..6 arrays x(0..n-1) of n elements with zero sum, and adjacent elements not both strictly positive and not both strictly negative.

Terms

    a(0) =1a(1) =13a(2) =67a(3) =545a(4) =3573a(5) =27457a(6) =193689a(7) =1462859a(8) =10651367a(9) =80142549a(10) =593254327a(11) =4466635929a(12) =33386730231a(13) =251884546233

External references