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.

A332729 Number of nonnegative integer n X n matrices with row and column sums 2 and sum of entries below the main diagonal n - 1.

Table of values

n a(n)
1 1
2 1
3 11
4 114
5 2438
6 73120
7 3107640
8 175157568
9 12683256458
10 1146644890542
11 126603925984322
12 16764298017398342
13 2622239904802101734
14 478350006311298468126
15 100655530463934465864626
16 24200010145455307873369888
17 6592700960401481917596215614
18 2020180735699844322843722782402

List of values

[1, 1, 11, 114, 2438, 73120, 3107640, 175157568, 12683256458, 1146644890542, 126603925984322, 16764298017398342, 2622239904802101734, 478350006311298468126, 100655530463934465864626, 24200010145455307873369888, 6592700960401481917596215614, 2020180735699844322843722782402]

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

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