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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.

A330658 Number of ways to place zero or more dominoes on an n X n grid with an equal number of horizontal and vertical dominoes.

Table of values

n a(n)
0 1
1 1
2 1
3 23
4 1608
5 371500
6 328956227
7 1126022690953
8 14806761014366079
9 744494518032208898560
10 142687918961909575461700797
11 103997384424546478979311463191760
12 287748628673335369235353717267441839979
13 3018422667417995172483450578913829739500058615

List of values

[1, 1, 1, 23, 1608, 371500, 328956227, 1126022690953, 14806761014366079, 744494518032208898560, 142687918961909575461700797, 103997384424546478979311463191760, 287748628673335369235353717267441839979, 3018422667417995172483450578913829739500058615]

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

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