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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.

A269059 Construct a hollow square of 1's of side n and fill its interior with 0's to create a stack of n binary numbers. Express the sum of the stack in decimal.

Table of values

n a(n)
1 1
2 6
3 19
4 48
5 113
6 258
7 579
8 1284
9 2821
10 6150
11 13319
12 28680
13 61449
14 131082
15 278539
16 589836
17 1245197
18 2621454
19 5505039
20 11534352
21 24117265
22 50331666
23 104857619
24 218103828
25 452984853
26 939524118
27 1946157079
28 4026531864
29 8321499161
30 17179869210
31 35433480219
32 73014444060

List of values

[1, 6, 19, 48, 113, 258, 579, 1284, 2821, 6150, 13319, 28680, 61449, 131082, 278539, 589836, 1245197, 2621454, 5505039, 11534352, 24117265, 50331666, 104857619, 218103828, 452984853, 939524118, 1946157079, 4026531864, 8321499161, 17179869210, 35433480219, 73014444060]

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

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