Number of resistance values that can be constructed using exactly n 1-ohm resistors in series or parallel but not with fewer resistors.

A051389

Number of resistance values that can be constructed using exactly n 1-ohm resistors in series or parallel but not with fewer resistors.

Terms

    a(0) =1a(1) =2a(2) =4a(3) =8a(4) =20a(5) =42a(6) =102a(7) =250a(8) =610a(9) =1486a(10) =3710a(11) =9228a(12) =23050a(13) =57718a(14) =145288a(15) =365820a(16) =922194a(17) =2327914a(18) =5885800a(19) =14890796a(20) =37701452a(21) =95550472a(22) =242325118a(23) =614869792a(24) =1561228066a(25) =3966071764a(26) =10080113232a(27) =25630109268a(28) =65194419268a(29) =165890640468

External references