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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.

A063505 Number of n X n upper triangular binary matrices over GF(2) B such that B^2 = 0.

Table of values

n a(n)
2 2
3 8
4 32
5 320
6 2592
7 57472
8 946176
9 44302336
10 1482686464
11 143210315776
12 9732400087040
13 1915349322694656
14 263918421714927616
15 105091512697853313024
16 29316605112733216538624
17 23522116026027393322844160
18 13266245323073952003913678848
19 21392237922664971275489914126336
20 24362629720999005014327927695736832

List of values

[2, 8, 32, 320, 2592, 57472, 946176, 44302336, 1482686464, 143210315776, 9732400087040, 1915349322694656, 263918421714927616, 105091512697853313024, 29316605112733216538624, 23522116026027393322844160, 13266245323073952003913678848, 21392237922664971275489914126336, 24362629720999005014327927695736832]

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

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