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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.

A192054 Let u, v be binary vectors of length n, let f(u,v) be length of longest carry propagation when we form the binary sum u+v; then a(n) = Sum_{u,v} f(u,v).

Table of values

n a(n)
0 0
1 1
2 9
3 57
4 307
5 1517
6 7103
7 32117
8 141711
9 614429
10 2629495
11 11141893
12 46846671
13 195760429
14 813970695
15 3370693013
16 13910890431
17 57246635581
18 235011903671
19 962772769829
20 3937069121647
21 16074491903309
22 65538899349479
23 266887332403125
24 1085630844057375
25 4411756408116573
26 17912600251244567
27 72670852531322949
28 294610539143446735

List of values

[0, 1, 9, 57, 307, 1517, 7103, 32117, 141711, 614429, 2629495, 11141893, 46846671, 195760429, 813970695, 3370693013, 13910890431, 57246635581, 235011903671, 962772769829, 3937069121647, 16074491903309, 65538899349479, 266887332403125, 1085630844057375, 4411756408116573, 17912600251244567, 72670852531322949, 294610539143446735]

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