Number of -4..4 arrays X (0..n-1) of n elements with zero sum and elements alternately strictly increasing and strictly decreasing.
A200053
Number of -4..4 arrays X (0..n-1) of n elements with zero sum and elements alternately strictly increasing and strictly decreasing.
Terms
- a(0) =1a(1) =8a(2) =36a(3) =172a(4) =840a(5) =4172a(6) =20978a(7) =106674a(8) =545698a(9) =2811236a(10) =14534258a(11) =75522854a(12) =393338058a(13) =2056376914a(14) =10767639532a(15) =56550307652a(16) =297322835298
External references
- oeis: A200053