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.

A240778 Number of n X 3 0..1 arrays with no element equal to fewer vertical neighbors than horizontal neighbors, with new values 0..1 introduced in row major order.

Table of values

n a(n)
1 1
2 4
3 20
4 97
5 459
6 2187
7 10442
8 49861
9 238068
10 1136678
11 5427201
12 25912833
13 123723975
14 590735140
15 2820536641
16 13466994652
17 64299801122
18 307007207679
19 1465843189533
20 6998846289463
21 33416841401200
22 159552766705917

List of values

[1, 4, 20, 97, 459, 2187, 10442, 49861, 238068, 1136678, 5427201, 25912833, 123723975, 590735140, 2820536641, 13466994652, 64299801122, 307007207679, 1465843189533, 6998846289463, 33416841401200, 159552766705917]

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

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