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.

A224019 Number of n X 3 0..3 arrays with rows nondecreasing and antidiagonals unimodal.

Table of values

n a(n)
1 20
2 400
3 6796
4 112436
5 1859020
6 30756756
7 508916456
8 8420768936
9 139333478144
10 2305467501680
11 38147189410288
12 631198698504112
13 10444066884547776
14 172811720487440320
15 2859412053301829248
16 47312978931444876928

List of values

[20, 400, 6796, 112436, 1859020, 30756756, 508916456, 8420768936, 139333478144, 2305467501680, 38147189410288, 631198698504112, 10444066884547776, 172811720487440320, 2859412053301829248, 47312978931444876928]

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

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