Number of -n..n arrays of 5 elements with first through fourth differences also in -n..n.

Terms

a(0) =19a(1) =213a(2) =1101a(3) =3785a(4) =10205a(5) =23425a(6) =47713a(7) =89007a(8) =154971a(9) =255311a(10) =401933a(11) =609517a(12) =895003a(13) =1278825a(14) =1784361a(15) =2438483a(16) =3271643a(17) =4318837a(18) =5618137a(19) =7213161a(20) =9151545a(21) =11485961a(22) =14273951a(23) =17579509a(24) =21470299a(25) =26021835a(26) =31314591a(27) =37435583a(28) =44478011