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.

A212240 Number of 2 X 2 matrices M with all terms in {1,...,n} and permanent(M) >= n.

Table of values

n a(n)
0 0
1 1
2 16
3 80
4 251
5 612
6 1269
7 2354
8 4021
9 6449
10 9844
11 14427
12 20458
13 28203
14 37972
15 50073
16 64876
17 82725
18 104046
19 129222
20 158741
21 193024
22 232607
23 277956
24 329675
25 388248
26 454353
27 528508
28 611435
29 703712
30 806121
31 919242
32 1043953
33 1180865

List of values

[0, 1, 16, 80, 251, 612, 1269, 2354, 4021, 6449, 9844, 14427, 20458, 28203, 37972, 50073, 64876, 82725, 104046, 129222, 158741, 193024, 232607, 277956, 329675, 388248, 454353, 528508, 611435, 703712, 806121, 919242, 1043953, 1180865]