T(n,k)=Number of arrangements of n+2 nonzero numbers x(i) in -k..k with the sum of x(i)*x(i+1) equal to zero.

A188249

T(n,k)=Number of arrangements of n+2 nonzero numbers x(i) in -k..k with the sum of x(i)*x(i+1) equal to zero.

Terms

    a(0) =4a(1) =16a(2) =0a(3) =36a(4) =20a(5) =12a(6) =64a(7) =52a(8) =120a(9) =0a(10) =100a(11) =144a(12) =548a(13) =300a(14) =40a(15) =144a(16) =208a(17) =1504a(18) =1632a(19) =1284a(20) =0a(21) =196a(22) =436a(23) =3292a(24) =7092a(25) =12692a(26) =4132a(27) =140a(28) =256a(29) =532

External references