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.

A139813 A polynomial triangle based on cross binomial Hodge number matrices/ Hodge diamonds that represent Calabi-Yau type binomials and their monomials.

Table of values

n a(n)
1 1
2 2
3 2
4 2
5 2
6 2
7 2
8 6
9 6
10 2
11 2
12 8
13 6
14 8
15 2
16 2
17 10
18 20
19 20
20 10
21 2
22 2
23 12
24 30
25 20
26 30
27 12
28 2
29 2
30 14
31 42
32 70
33 70
34 42
35 14
36 2
37 2
38 16
39 56
40 112
41 70
42 112
43 56
44 16
45 2
46 2
47 18
48 72
49 168
50 252
51 252
52 168
53 72
54 18
55 2
56 2
57 20
58 90
59 240
60 420
61 252
62 420
63 240
64 90
65 20
66 2

List of values

[1, 2, 2, 2, 2, 2, 2, 6, 6, 2, 2, 8, 6, 8, 2, 2, 10, 20, 20, 10, 2, 2, 12, 30, 20, 30, 12, 2, 2, 14, 42, 70, 70, 42, 14, 2, 2, 16, 56, 112, 70, 112, 56, 16, 2, 2, 18, 72, 168, 252, 252, 168, 72, 18, 2, 2, 20, 90, 240, 420, 252, 420, 240, 90, 20, 2]

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

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