Number of strictly increasing arrangements of n nonzero numbers in -(n+2)..(n+2) with sum zero.

A188117

Number of strictly increasing arrangements of n nonzero numbers in -(n+2)..(n+2) with sum zero.

Terms

    a(0) =0a(1) =4a(2) =8a(3) =31a(4) =90a(5) =308a(6) =1032a(7) =3528a(8) =12124a(9) =42262a(10) =148518a(11) =525869a(12) =1874648a(13) =6725266a(14) =24260940a(15) =87958188a(16) =320349712a(17) =1171609968a(18) =4301272078a(19) =15846418258a(20) =58569008756a(21) =217121189648a(22) =807123533172

External references