T(n,k) = Number of strings of n+2 numbers x(i) in -k..k with the sum of x(i) equal to zero and the sums of x(i)*x(i+1) and x(i)*x(i+2) equal to each other.

A184061

T(n,k) = Number of strings of n+2 numbers x(i) in -k..k with the sum of x(i) equal to zero and the sums of x(i)*x(i+1) and x(i)*x(i+2) equal to each other.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =1a(4) =9a(5) =11a(6) =1a(7) =11a(8) =31a(9) =21a(10) =1a(11) =19a(12) =65a(13) =107a(14) =61a(15) =1a(16) =25a(17) =109a(18) =243a(19) =501a(20) =179a(21) =1a(22) =31a(23) =143a(24) =541a(25) =1731a(26) =2339a(27) =447a(28) =1a(29) =33

External references