The number of maximally large absolute-difference triangles consisting of positive integers <= n.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =16a(5) =32a(6) =44a(7) =72a(8) =128a(9) =220a(10) =380a(11) =620a(12) =1232a(13) =2400a(14) =3988a(15) =7008a(16) =14260a(17) =25512a(18) =50944a(19) =105560a(20) =197880a(21) =381432a(22) =785984a(23) =1443992a(24) =2981200a(25) =6623144a(26) =13044340a(27) =26020924a(28) =55781760a(29) =108592260