A051389 - cp's OEIS frontend

A051389 Number of resistance values that can be constructed using exactly n 1-ohm resistors in series or parallel but not with fewer resistors.

n	a(n)
1	1
2	2
3	4
4	8
5	20
6	42
7	102
8	250
9	610
10	1486
11	3710
12	9228
13	23050
14	57718
15	145288
16	365820
17	922194
18	2327914
19	5885800
20	14890796
21	37701452
22	95550472
23	242325118
24	614869792
25	1561228066
26	3966071764
27	10080113232
28	25630109268
29	65194419268
30	165890640468

[1, 2, 4, 8, 20, 42, 102, 250, 610, 1486, 3710, 9228, 23050, 57718, 145288, 365820, 922194, 2327914, 5885800, 14890796, 37701452, 95550472, 242325118, 614869792, 1561228066, 3966071764, 10080113232, 25630109268, 65194419268, 165890640468]

cp's OEIS Frontend

A051389 Number of resistance values that can be constructed using exactly n 1-ohm resistors in series or parallel but not with fewer resistors.

Table of values

List of values