Number of strictly increasing arrangements of n nonzero numbers in -(n+4)..(n+4) with sum zero.

A188119

Number of strictly increasing arrangements of n nonzero numbers in -(n+4)..(n+4) with sum zero.

Terms

    a(0) =0a(1) =6a(2) =18a(3) =80a(4) =296a(5) =1154a(6) =4376a(7) =16547a(8) =62222a(9) =233880a(10) =878268a(11) =3297368a(12) =12383528a(13) =46541138a(14) =175070668a(15) =659220634a(16) =2485025556a(17) =9378589340a(18) =35437315784a(19) =134061346668a(20) =507765754320

External references