Triangular numbers composed of digits {0,1,3}.

Terms

a(0) =1a(1) =3a(2) =10a(3) =300a(4) =3003a(5) =10011a(6) =303031a(7) =1010331a(8) =1030330a(9) =1313010a(10) =101111310a(11) =113033130a(12) =1033010331a(13) =11031100311a(14) =11033031331a(15) =31031010003a(16) =111111101310a(17) =313313301003