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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.

A140736 Triangle read by rows, X^n * [1,0,0,0,...]; where X = a tridiagonal matrix with (1,0,1,0,1,...) in the main diagonal and (1,1,1,...) in the sub- and subsubdiagonals.

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 1
5 1
6 3
7 2
8 1
9 1
10 1
11 5
12 4
13 6
14 3
15 1
16 1
17 1
18 7
19 6
20 15
21 10
22 10
23 4
24 1
25 1
26 1
27 9
28 8
29 28
30 21
31 35
32 20
33 15
34 5
35 1
36 1
37 1
38 11
39 10
40 45
41 36
42 84
43 56
44 70
45 35
46 21
47 6
48 1
49 1
50 1
51 13
52 12
53 66
54 55
55 165
56 120
57 210
58 126
59 126
60 56
61 28
62 7
63 1

List of values

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

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

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