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.

A223772 Number of n X 3 0..1 arrays with rows and columns unimodal and antidiagonals nondecreasing.

Table of values

n a(n)
1 7
2 28
3 78
4 180
5 371
6 707
7 1269
8 2170
9 3563
10 5650
11 8692
12 13020
13 19047
14 27281
15 38339
16 52962
17 72031
18 96584
19 127834
20 167188
21 216267
22 276927
23 351281
24 441722
25 550947
26 681982
27 838208
28 1023388
29 1241695
30 1497741
31 1796607
32 2143874
33 2545655
34 3008628

List of values

[7, 28, 78, 180, 371, 707, 1269, 2170, 3563, 5650, 8692, 13020, 19047, 27281, 38339, 52962, 72031, 96584, 127834, 167188, 216267, 276927, 351281, 441722, 550947, 681982, 838208, 1023388, 1241695, 1497741, 1796607, 2143874, 2545655, 3008628]