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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.

A237111 Triangle read by rows: numerators of coefficients of the Hirzebruch L-polynomials L_n expressing the signature of a 4n-dimensional manifold in terms of its Pontrjagin numbers (as in Hirzebruch Signature Theorem).

Table of values

n a(n)
1 1
2 7
3 -1
4 62
5 -13
6 2
7 381
8 -71
9 -19
10 22
11 -3
12 5110
13 -919
14 -336
15 237
16 127
17 -83
18 10
19 2828954
20 -503904
21 -159287
22 122523
23 -40247
24 86901
25 -33863
26 8718
27 -27635
28 12842
29 -1382
30 3440220
31 -611266
32 -185150
33 146256
34 -62274
35 88137
36 -37290
37 22027
38 16696
39 -39341
40 10692
41 -7978
42 11880
43 -4322
44 420

List of values

[1, 7, -1, 62, -13, 2, 381, -71, -19, 22, -3, 5110, -919, -336, 237, 127, -83, 10, 2828954, -503904, -159287, 122523, -40247, 86901, -33863, 8718, -27635, 12842, -1382, 3440220, -611266, -185150, 146256, -62274, 88137, -37290, 22027, 16696, -39341, 10692, -7978, 11880, -4322, 420]