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.

A193277 Triangle T(n,k), n>=1, 0<=k<=(3+3^n)/2, read by rows: row n gives the coefficients of the chromatic polynomial of the Sierpinski gasket graph S_n, highest powers first.

Table of values

n a(n)
1 1
2 -3
3 2
4 0
5 1
6 -9
7 32
8 -56
9 48
10 -16
11 0
12 1
13 -27
14 339
15 -2625
16 14016
17 -54647
18 160663
19 -362460
20 631828
21 -848736
22 866640
23 -653248
24 343744
25 -112896
26 17408
27 0
28 1
29 -81
30 3204
31 -82476
32 1553454
33 -22823259
34 272286183
35 -2711405961
36 22990179324

List of values

[1, -3, 2, 0, 1, -9, 32, -56, 48, -16, 0, 1, -27, 339, -2625, 14016, -54647, 160663, -362460, 631828, -848736, 866640, -653248, 343744, -112896, 17408, 0, 1, -81, 3204, -82476, 1553454, -22823259, 272286183, -2711405961, 22990179324]