Largest n-digit number - largest n-digit triangular number.

Terms

a(0) =3a(1) =8a(2) =9a(3) =129a(4) =318a(5) =1008a(6) =2843a(7) =8988a(8) =38439a(9) =121089a(10) =42708a(11) =88208a(12) =2034819a(13) =1749819a(14) =2235879a(15) =104271309a(16) =447194784a(17) =1234742858a(18) =2234186964a(19) =3266133123a(20) =22172578524a(21) =114481278033a(22) =204796672749a(23) =841526085621a(24) =355055477499