Numbers which are sums of consecutive triangular numbers.

Terms

a(0) =0a(1) =1a(2) =3a(3) =4a(4) =6a(5) =9a(6) =10a(7) =15a(8) =16a(9) =19a(10) =20a(11) =21a(12) =25a(13) =28a(14) =31a(15) =34a(16) =35a(17) =36a(18) =45a(19) =46a(20) =49a(21) =52a(22) =55a(23) =56a(24) =64a(25) =66a(26) =74a(27) =78a(28) =80a(29) =81