Number of -5..5 arrays x(0..n-1) of n elements with zero sum, and adjacent elements not both strictly positive and not both strictly negative.

A199895

Number of -5..5 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) =11a(2) =51a(3) =351a(4) =2031a(5) =13363a(6) =82555a(7) =536967a(8) =3409609a(9) =22163661a(10) =142744843a(11) =930121865a(12) =6040974735a(13) =39482258363a(14) =257848379869

External references