Number of integers in the smallest interval containing both minimal and maximal possible apex values of an addition triangle whose base is a permutation of n+1 consecutive integers.

A206604

Number of integers in the smallest interval containing both minimal and maximal possible apex values of an addition triangle whose base is a permutation of n+1 consecutive integers.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =9a(4) =27a(5) =73a(6) =189a(7) =465a(8) =1115a(9) =2601a(10) =5973a(11) =13489a(12) =30149a(13) =66641a(14) =146233a(15) =318369a(16) =689403a(17) =1484137a(18) =3181797a(19) =6790641a(20) =14445101a(21) =30617841a(22) =64724553a(23) =136426849a(24) =286926757a(25) =601999633a(26) =1260707529a(27) =2634831585a(28) =5497982025a(29) =11452601761

External references