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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.

A201275 Number of n X 6 0..2 arrays with every row and column nondecreasing rightwards and downwards, and the number of instances of each value within one of each other.

Table of values

n a(n)
0 1
1 1
2 9
3 41
4 143
5 442
6 1260
7 3113
8 7331
9 15969
10 32737
11 63942
12 120318
13 216392
14 377902
15 640970
16 1055829
17 1699241
18 2679576
19 4132842
20 6267048
21 9345121
22 13712218
23 19841970
24 28343579
25 39963063
26 55722233
27 76873873
28 104958237
29 141966994
30 190366323
31 253040267
32 333758897

List of values

[1, 1, 9, 41, 143, 442, 1260, 3113, 7331, 15969, 32737, 63942, 120318, 216392, 377902, 640970, 1055829, 1699241, 2679576, 4132842, 6267048, 9345121, 13712218, 19841970, 28343579, 39963063, 55722233, 76873873, 104958237, 141966994, 190366323, 253040267, 333758897]

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

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