Number of triangular numbers T(k) between powers of 2, 2^(n-1) < T(k) <= 2^n.

Terms

a(0) =1a(1) =0a(2) =1a(3) =1a(4) =2a(5) =2a(6) =3a(7) =5a(8) =7a(9) =9a(10) =13a(11) =19a(12) =27a(13) =37a(14) =53a(15) =75a(16) =106a(17) =150a(18) =212a(19) =300a(20) =424a(21) =600a(22) =848a(23) =1200a(24) =1697a(25) =2399a(26) =3393a(27) =4799a(28) =6786a(29) =9598