Largest triangular number less than or equal to sum of previous terms with a(0)=1.

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =6a(5) =10a(6) =21a(7) =36a(8) =78a(9) =153a(10) =300a(11) =595a(12) =1176a(13) =2346a(14) =4656a(15) =9316a(16) =18528a(17) =37128a(18) =74305a(19) =148240a(20) =296835a(21) =593505a(22) =1186570a(23) =2372931a(24) =4744740a(25) =9489546a(26) =18975880a(27) =37953828a(28) =75909681a(29) =151806600