Number of arrangements of 7 numbers x(i) in -n..n with the sum of x(i)*x(i+1) equal to zero.

A188362

Number of arrangements of 7 numbers x(i) in -n..n with the sum of x(i)*x(i+1) equal to zero.

Terms

    a(0) =627a(1) =9153a(2) =49747a(3) =181449a(4) =480363a(5) =1171345a(6) =2295051a(7) =4409889a(8) =7651651a(9) =12818961a(10) =19584123a(11) =30982585a(12) =44149827a(13) =63627969a(14) =89493523a(15) =123568713

External references