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.

A357141 Number of n X n triangular matrices with nonnegative integer entries and without zero rows or columns such that sum of all entries is equal to 2n.

Table of values

n a(n)
0 1
1 1
2 6
3 71
4 1433
5 44443
6 1968580
7 118159971
8 9240555677
9 913352224942
10 111374887418013
11 16428282185046946
12 2883740893056526715
13 594152447495864629867
14 142006380268368661423424
15 38973735372090120549251580
16 12174162204364698538764222978
17 4294569227671480526607187583713

List of values

[1, 1, 6, 71, 1433, 44443, 1968580, 118159971, 9240555677, 913352224942, 111374887418013, 16428282185046946, 2883740893056526715, 594152447495864629867, 142006380268368661423424, 38973735372090120549251580, 12174162204364698538764222978, 4294569227671480526607187583713]

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

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