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.

A266938 Number of 5Xn binary arrays with rows lexicographically nondecreasing and columns lexicographically nondecreasing and row sums nondecreasing and column sums nonincreasing.

Table of values

n a(n)
1 6
2 19
3 44
4 100
5 210
6 429
7 816
8 1534
9 2727
10 4753
11 7931
12 13044
13 20676
14 32360
15 49327
16 73959
17 108612
18 157751
19 224746
20 317514
21 440564
22 606496
23 823905
24 1110469
25 1480403
26 1957027
27 2563177
28 3335398
29 4302564
30 5520403
31 7021711
32 8888187
33 11173884

List of values

[6, 19, 44, 100, 210, 429, 816, 1534, 2727, 4753, 7931, 13044, 20676, 32360, 49327, 73959, 108612, 157751, 224746, 317514, 440564, 606496, 823905, 1110469, 1480403, 1957027, 2563177, 3335398, 4302564, 5520403, 7021711, 8888187, 11173884]