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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.

A230081 Sequence needed for the nonpositive powers of rho(11) = 2*cos(Pi/11) in the power basis of the degree 5 number field Q(rho(11)). Negative of the coefficients of the second power.

Table of values

n a(n)
0 0
1 4
2 13
3 50
4 173
5 613
6 2149
7 7557
8 26543
9 93264
10 327657
11 1151183
12 4044478
13 14209634
14 49923211
15 175397097
16 616229093
17 2165020570
18 7606447024
19 26724012524
20 93890464368
21 329868851103
22 1158940469863
23 4071748539926
24 14305425173111

List of values

[0, 4, 13, 50, 173, 613, 2149, 7557, 26543, 93264, 327657, 1151183, 4044478, 14209634, 49923211, 175397097, 616229093, 2165020570, 7606447024, 26724012524, 93890464368, 329868851103, 1158940469863, 4071748539926, 14305425173111]

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

Content is available under The OEIS End-User License Agreement.