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.

A266471 Number of 4 X n binary arrays with rows and columns lexicographically nondecreasing and column sums nonincreasing.

Table of values

n a(n)
1 5
2 12
3 29
4 66
5 137
6 261
7 463
8 775
9 1237
10 1898
11 2817
12 4064
13 5721
14 7883
15 10659
16 14173
17 18565
18 23992
19 30629
20 38670
21 48329
22 59841
23 73463
24 89475
25 108181
26 129910
27 155017
28 183884
29 216921
30 254567
31 297291
32 345593
33 400005
34 461092
35 529453
36 605722
37 690569

List of values

[5, 12, 29, 66, 137, 261, 463, 775, 1237, 1898, 2817, 4064, 5721, 7883, 10659, 14173, 18565, 23992, 30629, 38670, 48329, 59841, 73463, 89475, 108181, 129910, 155017, 183884, 216921, 254567, 297291, 345593, 400005, 461092, 529453, 605722, 690569]