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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.

A187256 Number of peakless Motzkin paths of length n, assuming that the (1,0)-steps come in 2 colors.

Table of values

n a(n)
0 1
1 2
2 4
3 10
4 28
5 82
6 248
7 770
8 2440
9 7858
10 25644
11 84618
12 281844
13 946338
14 3199728
15 10885122
16 37230352
17 127951714
18 441633812
19 1530242954
20 5320853260
21 18560408050
22 64932101224
23 227767796482
24 800928670232
25 2822814469394
26 9969770245948
27 35280714655498

List of values

[1, 2, 4, 10, 28, 82, 248, 770, 2440, 7858, 25644, 84618, 281844, 946338, 3199728, 10885122, 37230352, 127951714, 441633812, 1530242954, 5320853260, 18560408050, 64932101224, 227767796482, 800928670232, 2822814469394, 9969770245948, 35280714655498]

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

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