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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.

A253007 Number of n X 4 nonnegative integer arrays with upper left 0 and lower right its king-move distance away minus 3 and every value increasing by 0 or 1 with every step right, diagonally se or down.

Table of values

n a(n)
1 1
2 1
3 1
4 1
5 124
6 3423
7 33533
8 158877
9 490403
10 1156178
11 2286874
12 4013538
13 6467242
14 9779058
15 14080058
16 19501314
17 26173898
18 34228882
19 43797338
20 55010338
21 67998954
22 82894258
23 99827322
24 118929218
25 140331018
26 164163794
27 190558618
28 219646562

List of values

[1, 1, 1, 1, 124, 3423, 33533, 158877, 490403, 1156178, 2286874, 4013538, 6467242, 9779058, 14080058, 19501314, 26173898, 34228882, 43797338, 55010338, 67998954, 82894258, 99827322, 118929218, 140331018, 164163794, 190558618, 219646562]

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

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