a(n) = number of subsets S of {1,2,...,n} having more than 2 elements such that (sum of least two elements of S) > difference between greatest two elements of S.

A357290

a(n) = number of subsets S of {1,2,...,n} having more than 2 elements such that (sum of least two elements of S) > difference between greatest two elements of S.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =1a(4) =5a(5) =15a(6) =39a(7) =91a(8) =200a(9) =424a(10) =879a(11) =1796a(12) =3639a(13) =7334a(14) =14734a(15) =29545a(16) =59179a(17) =118459a(18) =237033a(19) =474195a(20) =948534a(21) =1897228a(22) =3794633a(23) =7589460a(24) =15179133a(25) =30358498a(26) =60717248a(27) =121434769a(28) =242869833a(29) =485739983

External references