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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.

A026571 a(n) = T(n,n-2), T given by A026568. Also a(n) = number of integer strings s(0), ..., s(n) counted by T, such that s(n) = 2.

Table of values

n a(n)
2 1
3 2
4 7
5 16
6 44
7 106
8 273
9 672
10 1696
11 4214
12 10573
13 26392
14 66151
15 165578
16 415277
17 1041480
18 2615004
19 6568450
20 16512355
21 41531360
22 104526093
23 263206638
24 663143211
25 1671581968
26 4215574482
27 10635988422
28 26846320149
29 67790042264

List of values

[1, 2, 7, 16, 44, 106, 273, 672, 1696, 4214, 10573, 26392, 66151, 165578, 415277, 1041480, 2615004, 6568450, 16512355, 41531360, 104526093, 263206638, 663143211, 1671581968, 4215574482, 10635988422, 26846320149, 67790042264]

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

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