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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.

A288541 Number of Dyck paths of semilength n such that the minimal number of peaks over all positive levels equals two.

Table of values

n a(n)
2 1
3 0
4 0
5 3
6 13
7 30
8 61
9 172
10 619
11 2241
12 7736
13 25786
14 85315
15 286653
16 986444
17 3465777
18 12342188
19 44275218
20 159463056
21 576136367
22 2089063623
23 7607265038
24 27829092314
25 102263653872
26 377340952123
27 1397457667346
28 5192248524833
29 19348310336881
30 72292940817636

List of values

[1, 0, 0, 3, 13, 30, 61, 172, 619, 2241, 7736, 25786, 85315, 286653, 986444, 3465777, 12342188, 44275218, 159463056, 576136367, 2089063623, 7607265038, 27829092314, 102263653872, 377340952123, 1397457667346, 5192248524833, 19348310336881, 72292940817636]

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

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