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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.

A227505 Schroeder triangle sums: a(n) = A006603(n+3) - A006318(n+3) - A006319(n+2).

Table of values

n a(n)
1 1
2 6
3 31
4 154
5 763
6 3808
7 19197
8 97772
9 502749
10 2607658
11 13630635
12 71743478
13 379949431
14 2023314980
15 10828048409
16 58206726936
17 314157742457
18 1701817879214
19 9249717805207
20 50427858276754
21 275695956722547
22 1511164724634440
23 8302888160922965

List of values

[1, 6, 31, 154, 763, 3808, 19197, 97772, 502749, 2607658, 13630635, 71743478, 379949431, 2023314980, 10828048409, 58206726936, 314157742457, 1701817879214, 9249717805207, 50427858276754, 275695956722547, 1511164724634440, 8302888160922965]

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

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