cp's OEIS Frontend

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.

A261063 Number of solutions to c(1)*prime(3) + ... + c(2n-1)*prime(2n+1) = -1, where c(i) = +-1 for i > 1, c(1) = 1.

Table of values

n a(n)
1 0
2 0
3 0
4 1
5 6
6 8
7 40
8 67
9 373
10 1232
11 3330
12 13656
13 47111
14 164957
15 582042
16 1967152
17 7129046
18 26655235
19 94956602
20 353789267
21 1300061367
22 4765080122
23 17726643505
24 66038899483
25 245431428625
26 919911458949
27 3457983108462
28 12974054097333
29 49016641868213
30 185510228030858

List of values

[0, 0, 0, 1, 6, 8, 40, 67, 373, 1232, 3330, 13656, 47111, 164957, 582042, 1967152, 7129046, 26655235, 94956602, 353789267, 1300061367, 4765080122, 17726643505, 66038899483, 245431428625, 919911458949, 3457983108462, 12974054097333, 49016641868213, 185510228030858]