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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.

A334697 a(n) is the number of interior points in the n-th figure shown in A255011 (meaning the figure with 4n points on the perimeter), counted with multiplicity.

Table of values

n a(n)
1 1
2 50
3 363
4 1360
5 3665
6 8106
7 15715
8 27728
9 45585
10 70930
11 105611
12 151680
13 211393
14 287210
15 381795
16 498016
17 638945
18 807858
19 1008235
20 1243760
21 1518321
22 1836010
23 2201123
24 2618160
25 3091825
26 3627026
27 4228875
28 4902688
29 5653985
30 6488490
31 7412131
32 8431040
33 9551553
34 10780210
35 12123755
36 13589136
37 15183505
38 16914218
39 18788835

List of values

[1, 50, 363, 1360, 3665, 8106, 15715, 27728, 45585, 70930, 105611, 151680, 211393, 287210, 381795, 498016, 638945, 807858, 1008235, 1243760, 1518321, 1836010, 2201123, 2618160, 3091825, 3627026, 4228875, 4902688, 5653985, 6488490, 7412131, 8431040, 9551553, 10780210, 12123755, 13589136, 15183505, 16914218, 18788835]

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

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