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.
A357291
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) =0a(4) =0a(5) =0a(6) =1a(7) =3a(8) =8a(9) =19a(10) =42a(11) =89a(12) =185a(13) =378a(14) =766a(15) =1544a(16) =3102a(17) =6220a(18) =12459a(19) =24939a(20) =49902a(21) =99831a(22) =199692a(23) =399417a(24) =798871a(25) =1597782a(26) =3195608a(27) =6391264a(28) =12782580a(29) =25565216
External references
- oeis: A357291