Number of ways to select 4 numbers from the set of the first n natural numbers avoiding 3-term arithmetic progressions.
A300760
Number of ways to select 4 numbers from the set of the first n natural numbers avoiding 3-term arithmetic progressions.
Terms
- a(0) =0a(1) =1a(2) =4a(3) =10a(4) =25a(5) =51a(6) =98a(7) =165a(8) =267a(9) =407a(10) =601a(11) =849a(12) =1175a(13) =1580a(14) =2089a(15) =2703a(16) =3452a(17) =4338a(18) =5395a(19) =6622a(20) =8058a(21) =9706a(22) =11606a(23) =13758a(24) =16210a(25) =18963a(26) =22066a(27) =25520a(28) =29379a(29) =33645
External references
- oeis: A300760