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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.

A143659 Number of perfect matchings of the (2n+1) X (2n+1) grid H_n with a central unit hole.

Table of values

n a(n)
0 1
1 2
2 196
3 75272
4 599466256
5 28838245503008
6 22463213552677201984
7 123818965842734619629420672
8 9830731407624872890044690474098944
9 6011432546485776316904414215762657381908992

List of values

[1, 2, 196, 75272, 599466256, 28838245503008, 22463213552677201984, 123818965842734619629420672, 9830731407624872890044690474098944, 6011432546485776316904414215762657381908992]

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

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