Number of nonaveraging subsets on {1,2,...,n}.

Terms

a(0) =1a(1) =2a(2) =4a(3) =7a(4) =13a(5) =23a(6) =40a(7) =65a(8) =106a(9) =169a(10) =278a(11) =443a(12) =705a(13) =1117a(14) =1760a(15) =2692a(16) =4151a(17) =6314a(18) =9526a(19) =14127a(20) =20944a(21) =30848a(22) =45589a(23) =66495a(24) =96847a(25) =140840a(26) =204380a(27) =293822a(28) =425859a(29) =613446