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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.

A140737 Triangle read by rows, X^n * [1,0,0,0,...]; where X = an infinite tridiagonal matrix with (1,1,1,...) in the main and subdiagonals and (1,0,1,0,1,...) in the subsubdiagonal.

Table of values

n a(n)
1 1
2 1
3 1
4 1
5 1
6 2
7 3
8 1
9 1
10 1
11 3
12 6
13 4
14 5
15 1
16 1
17 1
18 4
19 10
20 10
21 15
22 6
23 7
24 1
25 1
26 1
27 5
28 15
29 20
30 35
31 21
32 28
33 8
34 9
35 1
36 1
37 1
38 6
39 21
40 35
41 70
42 56
43 84
44 36
45 45
46 10
47 11
48 1
49 1
50 1
51 7
52 28
53 56
54 126
55 126
56 210
57 120
58 165
59 55
60 66
61 12
62 13
63 1
64 1

List of values

[1, 1, 1, 1, 1, 2, 3, 1, 1, 1, 3, 6, 4, 5, 1, 1, 1, 4, 10, 10, 15, 6, 7, 1, 1, 1, 5, 15, 20, 35, 21, 28, 8, 9, 1, 1, 1, 6, 21, 35, 70, 56, 84, 36, 45, 10, 11, 1, 1, 1, 7, 28, 56, 126, 126, 210, 120, 165, 55, 66, 12, 13, 1, 1]

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

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