For S a subset of [ n ] = {1,2,3,...n}, let B_S = {x+y : x,y in S, x<y}; then a(n) is maximal cardinality of B_S intersect B_{[ n ]-S}.
A039799
For S a subset of [ n ] = {1,2,3,...n}, let B_S = {x+y : x,y in S, x<y}; then a(n) is maximal cardinality of B_S intersect B_{[ n ]-S}.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =1a(4) =1a(5) =2a(6) =3a(7) =6a(8) =6a(9) =9a(10) =10a(11) =12a(12) =14a(13) =17a(14) =19a(15) =21a(16) =23a(17) =25a(18) =27a(19) =29a(20) =31a(21) =33a(22) =35a(23) =37a(24) =39a(25) =41a(26) =43a(27) =45a(28) =47a(29) =49
External references
- oeis: A039799