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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.

A266386 Sum over all Motzkin paths of length n of products over all peaks p of (x_p+n*y_p)/y_p, where x_p and y_p are the coordinates of peak p.

Table of values

n a(n)
0 1
1 1
2 4
3 11
4 62
5 243
6 1575
7 7721
8 54985
9 316407
10 2427309
11 15798261
12 129072167
13 927577835
14 8008756470
15 62499194297
16 567017727805
17 4747097031375
18 45051331382395
19 400942371431173
20 3965769826314532
21 37252002703698003
22 382848953452815450
23 3774255187367667473

List of values

[1, 1, 4, 11, 62, 243, 1575, 7721, 54985, 316407, 2427309, 15798261, 129072167, 927577835, 8008756470, 62499194297, 567017727805, 4747097031375, 45051331382395, 400942371431173, 3965769826314532, 37252002703698003, 382848953452815450, 3774255187367667473]

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

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