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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.

A380451 Number of disjoint-path coverings for 2 X n rectangular grids, admitting zero-length paths.

Table of values

n a(n)
1 2
2 15
3 95
4 604
5 3835
6 24349
7 154594
8 981531
9 6231827
10 39566420
11 251210695
12 1594958889
13 10126534850
14 64294264119
15 408209961239
16 2591761096236
17 16455320099427
18 104476280613925
19 663329132764770
20 4211535247894499
21 26739409243687915
22 169770870862086564
23 1077890252944724559
24 6843620413168932241
25 43450750418785228802

List of values

[2, 15, 95, 604, 3835, 24349, 154594, 981531, 6231827, 39566420, 251210695, 1594958889, 10126534850, 64294264119, 408209961239, 2591761096236, 16455320099427, 104476280613925, 663329132764770, 4211535247894499, 26739409243687915, 169770870862086564, 1077890252944724559, 6843620413168932241, 43450750418785228802]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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