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.

A250655 Number of (n+1) X (7+1) 0..1 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction.

Table of values

n a(n)
1 81
2 169
3 345
4 697
5 1401
6 2809
7 5625
8 11257
9 22521
10 45049
11 90105
12 180217
13 360441
14 720889
15 1441785
16 2883577
17 5767161
18 11534329
19 23068665
20 46137337
21 92274681
22 184549369
23 369098745
24 738197497
25 1476395001
26 2952790009
27 5905580025

List of values

[81, 169, 345, 697, 1401, 2809, 5625, 11257, 22521, 45049, 90105, 180217, 360441, 720889, 1441785, 2883577, 5767161, 11534329, 23068665, 46137337, 92274681, 184549369, 369098745, 738197497, 1476395001, 2952790009, 5905580025]

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

Content is available under The OEIS End-User License Agreement.