a(n) is the cardinality of the "Cross Set" which is the subset of distinct resistances that can be produced by a circuit of n unit resistors using only series or parallel combinations which cannot be decomposed as a single unit resistor in either series or parallel with a circuit of n-1 unit resistors.

A176497

a(n) is the cardinality of the "Cross Set" which is the subset of distinct resistances that can be produced by a circuit of n unit resistors using only series or parallel combinations which cannot be decomposed as a single unit resistor in either series or parallel with a circuit of n-1 unit resistors.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =1a(4) =4a(5) =9a(6) =25a(7) =75a(8) =195a(9) =475a(10) =1265a(11) =3135a(12) =7983a(13) =19697a(14) =50003a(15) =126163a(16) =317629a(17) =802945a(18) =2035619a(19) =5158039a(20) =13084381a(21) =33240845a(22) =84478199a(23) =214717585a(24) =546235003a(25) =1389896683a(26) =3537930077a(27) =9007910913a(28) =22942258567a(29) =58444273501

External references