Number of strictly increasing arrangements of n numbers in -(n+1)..(n+1) with sum zero.

A188175

Number of strictly increasing arrangements of n numbers in -(n+1)..(n+1) with sum zero.

Terms

    a(0) =1a(1) =3a(2) =8a(3) =24a(4) =73a(5) =227a(6) =734a(7) =2430a(8) =8150a(9) =27718a(10) =95514a(11) =332578a(12) =1168261a(13) =4136477a(14) =14749992a(15) =52925886a(16) =190973410a(17) =692583902a(18) =2523265494a(19) =9231352260a(20) =33901898722a(21) =124940568222a(22) =461938289518

External references