Number of arrangements of 5 nonzero numbers x(i) in -n..n with the sum of x(i)*x(i+1) equal to zero.

A188251

Number of arrangements of 5 nonzero numbers x(i) in -n..n with the sum of x(i)*x(i+1) equal to zero.

Terms

    a(0) =12a(1) =120a(2) =548a(3) =1504a(4) =3292a(5) =6376a(6) =10564a(7) =17040a(8) =25436a(9) =36808a(10) =49556a(11) =68912a(12) =87804a(13) =113384a(14) =144644a(15) =180912a(16) =216044a(17) =267160a(18) =312404a(19) =377904a(20) =446588a(21) =519976a(22) =590420a(23) =696576a(24) =791164a(25) =898456a(26) =1016756a(27) =1159280a(28) =1278636a(29) =1460936

External references