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.

A370059 Number of traceless symmetric binary matrices with 2n 1's and all row sums >= 2.

Table of values

n a(n)
0 1
1 0
2 0
3 1
4 3
5 18
6 156
7 1555
8 17907
9 234031
10 3414375
11 54984258
12 968680368
13 18532158756
14 382616109012
15 8479409847277
16 200776196593073
17 5058600736907013
18 135130222251100358
19 3814891312969572209
20 113492694557655580989
21 3548800852807887882157
22 116359373033373284971070

List of values

[1, 0, 0, 1, 3, 18, 156, 1555, 17907, 234031, 3414375, 54984258, 968680368, 18532158756, 382616109012, 8479409847277, 200776196593073, 5058600736907013, 135130222251100358, 3814891312969572209, 113492694557655580989, 3548800852807887882157, 116359373033373284971070]

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

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