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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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.

Table of values

n a(n)
1 0
2 0
3 0
4 1
5 4
6 9
7 25
8 75
9 195
10 475
11 1265
12 3135
13 7983
14 19697
15 50003
16 126163
17 317629
18 802945
19 2035619
20 5158039
21 13084381
22 33240845
23 84478199
24 214717585
25 546235003
26 1389896683
27 3537930077
28 9007910913
29 22942258567
30 58444273501

List of values

[0, 0, 0, 1, 4, 9, 25, 75, 195, 475, 1265, 3135, 7983, 19697, 50003, 126163, 317629, 802945, 2035619, 5158039, 13084381, 33240845, 84478199, 214717585, 546235003, 1389896683, 3537930077, 9007910913, 22942258567, 58444273501]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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