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.

A250426 Number of (n+1)X(2+1) 0..1 arrays with nondecreasing sum of every two consecutive values in every row and column.

Table of values

n a(n)
1 36
2 108
3 324
4 720
5 1600
6 3000
7 5625
8 9450
9 15876
10 24696
11 38416
12 56448
13 82944
14 116640
15 164025
16 222750
17 302500
18 399300
19 527076
20 679536
21 876096
22 1107288
23 1399489
24 1739010
25 2160900
26 2646000
27 3240000
28 3916800
29 4734976
30 5659776
31 6765201
32 8005878

List of values

[36, 108, 324, 720, 1600, 3000, 5625, 9450, 15876, 24696, 38416, 56448, 82944, 116640, 164025, 222750, 302500, 399300, 527076, 679536, 876096, 1107288, 1399489, 1739010, 2160900, 2646000, 3240000, 3916800, 4734976, 5659776, 6765201, 8005878]