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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.

A114589 Number of hill-free Dyck paths of semilength n+3 and having no peaks at even levels (a hill in a Dyck path is a peak at level 1).

Table of values

n a(n)
0 1
1 1
2 3
3 7
4 17
5 43
6 110
7 286
8 753
9 2003
10 5376
11 14540
12 39589
13 108427
14 298512
15 825664
16 2293271
17 6393539
18 17885835
19 50191175
20 141247519
21 398537101
22 1127203038
23 3195229662
24 9076078057
25 25830193513
26 73643406563
27 210312889095

List of values

[1, 1, 3, 7, 17, 43, 110, 286, 753, 2003, 5376, 14540, 39589, 108427, 298512, 825664, 2293271, 6393539, 17885835, 50191175, 141247519, 398537101, 1127203038, 3195229662, 9076078057, 25830193513, 73643406563, 210312889095]

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

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