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A340921 a(n) is the number of distinct resistances that can be produced using at most n unit resistors in a planar network. 1
1, 2, 4, 8, 16, 36, 80, 194, 506, 1400, 4024, 11870, 35200, 104836, 311686, 929088, 2776618, 8321128, 24967712, 74985708 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

The relation of this sequence to A340920 is the analog of the relation of A180414 to A337517.

LINKS

Table of n, a(n) for n=0..19.

FORMULA

a(n) = A180414(n) for n <= 9, a(n) < A180414(n) for n >= 10.

CROSSREFS

Cf. A153588, A174284, A174286, A180414, A337517, A340920.

Sequence in context: A034341 A341536 A034342 * A180414 A007669 A034343

Adjacent sequences:  A340918 A340919 A340920 * A340922 A340923 A340924

KEYWORD

nonn,more,hard

AUTHOR

Hugo Pfoertner and Rainer Rosenthal, Feb 14 2021

EXTENSIONS

a(19) from Hugo Pfoertner, Mar 15 2021

STATUS

approved

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Last modified January 28 12:42 EST 2022. Contains 350656 sequences. (Running on oeis4.)