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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.

A071949 Triangle read by rows of numbers of paths in a lattice satisfying certain conditions.

Table of values

n a(n)
0 1
1 1
2 2
3 1
4 4
5 10
6 1
7 6
8 24
9 66
10 1
11 8
12 42
13 172
14 498
15 1
16 10
17 64
18 326
19 1360
20 4066
21 1
22 12
23 90
24 536
25 2706
26 11444
27 34970
28 1
29 14
30 120
31 810
32 4672
33 23526
34 100520
35 312066
36 1
37 16
38 154
39 1156
40 7410
41 42024
42 211546
43 911068
44 2862562
45 1
46 18
47 192
48 1582
49 11088
50 69002
51 387456
52 1951494
53 8457504
54 26824386

List of values

[1, 1, 2, 1, 4, 10, 1, 6, 24, 66, 1, 8, 42, 172, 498, 1, 10, 64, 326, 1360, 4066, 1, 12, 90, 536, 2706, 11444, 34970, 1, 14, 120, 810, 4672, 23526, 100520, 312066, 1, 16, 154, 1156, 7410, 42024, 211546, 911068, 2862562, 1, 18, 192, 1582, 11088, 69002, 387456, 1951494, 8457504, 26824386]

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

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