Negated inverse Euler transform of {-1 if n is a triangular number else 0, n > 0} = -A010054.

Terms

a(0) =1a(1) =1a(2) =0a(3) =1a(4) =1a(5) =1a(6) =2a(7) =3a(8) =3a(9) =5a(10) =8a(11) =11a(12) =14a(13) =23a(14) =31a(15) =47a(16) =68a(17) =101a(18) =144a(19) =217a(20) =315a(21) =471a(22) =693a(23) =1035a(24) =1528a(25) =2287a(26) =3397a(27) =5085a(28) =7587a(29) =11377