T(n,k)=Number of arrangements of n+1 numbers x(i) in -k..k with the sum of x(i)*x(i+1) equal to zero.
A188358
T(n,k)=Number of arrangements of n+1 numbers x(i) in -k..k with the sum of x(i)*x(i+1) equal to zero.
Terms
- a(0) =5a(1) =9a(2) =15a(3) =13a(4) =45a(5) =29a(6) =17a(7) =91a(8) =117a(9) =91a(10) =21a(11) =153a(12) =257a(13) =565a(14) =197a(15) =25a(16) =231a(17) =497a(18) =1775a(19) =1953a(20) =627a(21) =29a(22) =325a(23) =749a(24) =4201a(25) =7369a(26) =9153a(27) =1477a(28) =33a(29) =435
External references
- oeis: A188358