Number of -2..2 arrays x(0..n-1) of n elements with zero sum, adjacent elements differing by more than one, and elements alternately increasing and decreasing.

A200186

Number of -2..2 arrays x(0..n-1) of n elements with zero sum, adjacent elements differing by more than one, and elements alternately increasing and decreasing.

Terms

    a(0) =1a(1) =4a(2) =6a(3) =14a(4) =24a(5) =54a(6) =104a(7) =230a(8) =464a(9) =1028a(10) =2128a(11) =4720a(12) =9918a(13) =22038a(14) =46760a(15) =104056a(16) =222338a(17) =495358a(18) =1064138a(19) =2373070a(20) =5119796a(21) =11425974a(22) =24738074a(23) =55242788a(24) =119958510a(25) =268018844a(26) =583462384a(27) =1304179214a(28) =2845288284a(29) =6362293924

External references