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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.

A026002 a(n) = T(n,n+2), where T = Delannoy triangle (A008288).

Table of values

n a(n)
1 1
2 7
3 41
4 231
5 1289
6 7183
7 40081
8 224143
9 1256465
10 7059735
11 39753273
12 224298231
13 1267854873
14 7178461215
15 40704778785
16 231128079903
17 1314016698401
18 7478998203943
19 42612705597769
20 243025194476551
21 1387226559025961
22 7924982285747247
23 45308321651001521

List of values

[1, 7, 41, 231, 1289, 7183, 40081, 224143, 1256465, 7059735, 39753273, 224298231, 1267854873, 7178461215, 40704778785, 231128079903, 1314016698401, 7478998203943, 42612705597769, 243025194476551, 1387226559025961, 7924982285747247, 45308321651001521]

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

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