a(n) is the number of nonnegative integers that can be represented by lighting only n segments on a 9-segment display, used by the Russian postal service.

A350177

a(n) is the number of nonnegative integers that can be represented by lighting only n segments on a 9-segment display, used by the Russian postal service.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =2a(4) =3a(5) =2a(6) =5a(7) =13a(8) =17a(9) =22a(10) =47a(11) =86a(12) =127a(13) =211a(14) =387a(15) =645a(16) =1044a(17) =1794a(18) =3086a(19) =5135a(20) =8608a(21) =14674a(22) =24805a(23) =41631a(24) =70322a(25) =119069a(26) =200768a(27) =338429a(28) =571845a(29) =965823

External references