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.

A253390 Number of (n+1)X(n+1) 0..1 arrays with every 2X2 subblock antidiagonal maximum minus diagonal minimum nondecreasing horizontally and diagonal maximum minus antidiagonal minimum nondecreasing vertically.

Table of values

n a(n)
1 16
2 102
3 174
4 346
5 666
6 1318
7 2726
8 5396
9 11392
10 22634
11 47926
12 95464
13 201644
14 402272
15 846688
16 1690724
17 3546388
18 7086130
19 14818262
20 29621624
21 61778428
22 123532896
23 257035176
24 514085752
25 1067445536
26 2135305688
27 4425565336
28 8853923848

List of values

[16, 102, 174, 346, 666, 1318, 2726, 5396, 11392, 22634, 47926, 95464, 201644, 402272, 846688, 1690724, 3546388, 7086130, 14818262, 29621624, 61778428, 123532896, 257035176, 514085752, 1067445536, 2135305688, 4425565336, 8853923848]

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

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