Minimal span of set of n elements with no 5-term arithmetic progression.

Terms

a(0) =5a(1) =6a(2) =7a(3) =8a(4) =10a(5) =11a(6) =12a(7) =13a(8) =15a(9) =16a(10) =17a(11) =18a(12) =23a(13) =24a(14) =26a(15) =27a(16) =28a(17) =30a(18) =32a(19) =33a(20) =35a(21) =36a(22) =37a(23) =38a(24) =40a(25) =41a(26) =42a(27) =43a(28) =48a(29) =50