a(n) = greatest number in row n of A026098 that is not a positive power of 2.

Terms

a(0) =1a(1) =3a(2) =6a(3) =10a(4) =15a(5) =24a(6) =33a(7) =44a(8) =55a(9) =69a(10) =92a(11) =115a(12) =138a(13) =161a(14) =186a(15) =217a(16) =248a(17) =287a(18) =328a(19) =369a(20) =410a(21) =451a(22) =492a(23) =533a(24) =590a(25) =649a(26) =708a(27) =767a(28) =826a(29) =885