Golomb-type sequence over triangular numbers.

Terms

a(0) =1a(1) =3a(2) =3a(3) =3a(4) =6a(5) =6a(6) =6a(7) =10a(8) =10a(9) =10a(10) =15a(11) =15a(12) =15a(13) =15a(14) =15a(15) =15a(16) =21a(17) =21a(18) =21a(19) =21a(20) =21a(21) =21a(22) =28a(23) =28a(24) =28a(25) =28a(26) =28a(27) =28a(28) =36a(29) =36