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.

A281123 Triangle T read by rows: n-th row (n>=0) gives the non-vanishing coefficients of the polynomial q(n,x) = 2^(-n)*((x+1)^(2^n) - (x-1)^(2^n))/2.

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 1
5 7
6 7
7 1
8 1
9 35
10 273
11 715
12 715
13 273
14 35
15 1
16 1
17 155
18 6293
19 105183
20 876525
21 4032015
22 10855425
23 17678835
24 17678835
25 10855425
26 4032015
27 876525
28 105183
29 6293
30 155
31 1
32 1
33 651
34 119133
35 9706503
36 430321633
37 11618684091
38 205263418941
39 2492484372855
40 21552658988805
41 136248095712855

List of values

[1, 1, 1, 1, 1, 7, 7, 1, 1, 35, 273, 715, 715, 273, 35, 1, 1, 155, 6293, 105183, 876525, 4032015, 10855425, 17678835, 17678835, 10855425, 4032015, 876525, 105183, 6293, 155, 1, 1, 651, 119133, 9706503, 430321633, 11618684091, 205263418941, 2492484372855, 21552658988805, 136248095712855]