a(1) = 0 and a(n+1) > a(n) is the smallest integer such that a(n+1)^2-a(n)^2 is triangular.

Terms

a(0) =0a(1) =1a(2) =2a(3) =5a(4) =14a(5) =41a(6) =46a(7) =137a(8) =410a(9) =1229a(10) =3686a(11) =3818a(12) =3982a(13) =4015a(14) =4036a(15) =4091a(16) =12272a(17) =12320a(18) =36959a(19) =36991a(20) =37328a(21) =40505a(22) =40615a(23) =40856a(24) =41542a(25) =44222a(26) =51913a(27) =54032a(28) =54785a(29) =164354