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.

A289316 The number of upper-triangular matrices whose nonzero entries are positive odd numbers summing to n and each row contains a nonzero entry.

Table of values

n a(n)
0 1
1 1
2 2
3 8
4 37
5 219
6 1557
7 12994
8 124427
9 1344506
10 16178891
11 214522339
12 3107144562
13 48805300668
14 826268787588
15 14998055299920
16 290550119360174
17 5983278021430064
18 130512410617529321
19 3006012061455129053
20 72900477505718600661

List of values

[1, 1, 2, 8, 37, 219, 1557, 12994, 124427, 1344506, 16178891, 214522339, 3107144562, 48805300668, 826268787588, 14998055299920, 290550119360174, 5983278021430064, 130512410617529321, 3006012061455129053, 72900477505718600661]

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

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