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.

A266102 Number of 2Xn integer arrays with each element equal to the number of horizontal and antidiagonal neighbors exactly one smaller than itself.

Table of values

n a(n)
1 1
2 5
3 13
4 36
5 100
6 233
7 680
8 2201
9 6508
10 18689
11 55362
12 167587
13 511996
14 1565487
15 4772336
16 14577149
17 44758492
18 137803612
19 424402090
20 1307283605
21 4029557464
22 12430685471
23 38368732042
24 118459868528
25 365782453416
26 1129647978659

List of values

[1, 5, 13, 36, 100, 233, 680, 2201, 6508, 18689, 55362, 167587, 511996, 1565487, 4772336, 14577149, 44758492, 137803612, 424402090, 1307283605, 4029557464, 12430685471, 38368732042, 118459868528, 365782453416, 1129647978659]

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

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