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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.

A093369 a(n) = sum of lengths of strings that can be generated by any starting string of n 2's and 3's that starts with a 2, using the rule described in the Comments lines.

Table of values

n a(n)
1 1
2 6
3 14
4 42
5 98
6 242
7 552
8 1394
9 2935
10 6471
11 14006
12 30060
13 64223
14 136914
15 290224
16 613509
17 1292567
18 2717311
19 5696864
20 11920124
21 24889066
22 51880008
23 107954163
24 224305440
25 465388743
26 964349526
27 1995808823
28 4125871527
29 8520180124
30 17577302639
31 36228352911

List of values

[1, 6, 14, 42, 98, 242, 552, 1394, 2935, 6471, 14006, 30060, 64223, 136914, 290224, 613509, 1292567, 2717311, 5696864, 11920124, 24889066, 51880008, 107954163, 224305440, 465388743, 964349526, 1995808823, 4125871527, 8520180124, 17577302639, 36228352911]

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

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