cp's OEIS Frontend

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.

A252872 Number of n X 4 nonnegative integer arrays with upper left 0 and lower right n+4-4 and value increasing by 0 or 1 with every step right or down.

Table of values

n a(n)
1 3
2 26
3 153
4 615
5 1953
6 5281
7 12686
8 27805
9 56624
10 108549
11 197804
12 345216
13 580452
14 944778
15 1494415
16 2304572
17 3474241
18 5131844
19 7441827
20 10612301
21 14903835
22 20639511
23 28216356
24 38118271
25 50930582
26 67356343
27 88234526
28 114560238

List of values

[3, 26, 153, 615, 1953, 5281, 12686, 27805, 56624, 108549, 197804, 345216, 580452, 944778, 1494415, 2304572, 3474241, 5131844, 7441827, 10612301, 14903835, 20639511, 28216356, 38118271, 50930582, 67356343, 88234526, 114560238]

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

Content is available under The OEIS End-User License Agreement.