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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.

A337640 a(n) = one-half of the number of cells in the central rectangle of the graph described in row 2n+1 of A333288.

Table of values

n a(n)
0 2
1 11
2 35
3 80
4 155
5 266
6 422
7 626
8 890
9 1223
10 1625
11 2108
12 2678
13 3341
14 4109
15 4988
16 5990
17 7106
18 8348
19 9734
20 11264
21 12953
22 14801
23 16820
24 19019
25 21389
26 23957
27 26717
28 29663
29 32834
30 36230
31 39860
32 43712
33 47795
34 52139
35 56726
36 61598
37 66746
38 72152
39 77837

List of values

[2, 11, 35, 80, 155, 266, 422, 626, 890, 1223, 1625, 2108, 2678, 3341, 4109, 4988, 5990, 7106, 8348, 9734, 11264, 12953, 14801, 16820, 19019, 21389, 23957, 26717, 29663, 32834, 36230, 39860, 43712, 47795, 52139, 56726, 61598, 66746, 72152, 77837]

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

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