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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.

A194477 Number of ways to arrange 5 indistinguishable points on an n X n X n triangular grid so that no three points are in the same row or diagonal.

Table of values

n a(n)
1 0
2 0
3 0
4 39
5 909
6 8568
7 50526
8 221508
9 789453
10 2412333
11 6542316
12 16127397
13 36762726
14 78495417
15 158548572
16 305303544
17 563965038
18 1004432454
19 1732013856
20 2901747051
21 4737236427
22 7555075374
23 11796103242
24 18064943820
25 27179490195
26 40232239515

List of values

[0, 0, 0, 39, 909, 8568, 50526, 221508, 789453, 2412333, 6542316, 16127397, 36762726, 78495417, 158548572, 305303544, 563965038, 1004432454, 1732013856, 2901747051, 4737236427, 7555075374, 11796103242, 18064943820, 27179490195, 40232239515]

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

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