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.

A275499 Number of n X 3 0..2 arrays with no element equal to any value at offset (-2,-1) (-2,0) or (-1,-1) and new values introduced in order 0..2.

Table of values

n a(n)
1 5
2 54
3 80
4 136
5 232
6 516
7 1168
8 2660
9 6024
10 13716
11 31168
12 70868
13 161176
14 366452
15 833360
16 1894996
17 4309160
18 9799012
19 22282576
20 50670228
21 115222840
22 262014052
23 595814224
24 1354867540
25 3080938312
26 7005983220
27 15931445856
28 36227745252

List of values

[5, 54, 80, 136, 232, 516, 1168, 2660, 6024, 13716, 31168, 70868, 161176, 366452, 833360, 1894996, 4309160, 9799012, 22282576, 50670228, 115222840, 262014052, 595814224, 1354867540, 3080938312, 7005983220, 15931445856, 36227745252]

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

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