T(n,k)=Number of -k..k arrays of n elements with adjacent element differences also in -k..k.

Terms

a(0) =3a(1) =5a(2) =7a(3) =7a(4) =19a(5) =17a(6) =9a(7) =37a(8) =75a(9) =41a(10) =11a(11) =61a(12) =203a(13) =295a(14) =99a(15) =13a(16) =91a(17) =429a(18) =1111a(19) =1161a(20) =239a(21) =15a(22) =127a(23) =781a(24) =3011a(25) =6083a(26) =4569a(27) =577a(28) =17a(29) =169