a(n) is the n-th nonnegative number to light exactly n segments when displayed on a calculator.

Terms

a(0) =71a(1) =77a(2) =47a(3) =61a(4) =70a(5) =52a(6) =62a(7) =99a(8) =136a(9) =190a(10) =246a(11) =263a(12) =306a(13) =589a(14) =882a(15) =1085a(16) =1838a(17) =2059a(18) =2308a(19) =2869a(20) =5886a(21) =8689a(22) =10800a(23) =18098a(24) =20268a(25) =20896a(26) =28608a(27) =58880a(28) =86886a(29) =106898