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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.

A113854 a(n) = sum(2^(A047240(i)-1), i=1..n).

Table of values

n a(n)
1 1
2 3
3 35
4 99
5 227
6 2275
7 6371
8 14563
9 145635
10 407779
11 932067
12 9320675
13 26097891
14 59652323
15 596523235
16 1670265059
17 3817748707
18 38177487075
19 106896963811
20 244335917283
21 2443359172835
22 6841405683939
23 15637498706147

List of values

[1, 3, 35, 99, 227, 2275, 6371, 14563, 145635, 407779, 932067, 9320675, 26097891, 59652323, 596523235, 1670265059, 3817748707, 38177487075, 106896963811, 244335917283, 2443359172835, 6841405683939, 15637498706147]

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

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