cp's OEIS Frontend

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.

A217941 a(n) = Sum_{k=1..n} k*C(n,k), where C(n,k) = number of binary sequences of length n and curling number k (A216955).

Table of values

n a(n)
1 2
2 6
3 14
4 32
5 66
6 140
7 282
8 574
9 1156
10 2326
11 4654
12 9348
13 18698
14 37436
15 74904
16 149896
17 299794
18 599780
19 1199562
20 2399448
21 4798996
22 9598556
23 19197114
24 38395584
25 76791200
26 153584626
27 307169622
28 614343808
29 1228687618
30 2457384892
31 4914769786
32 9829557516
33 19659116482
34 39318268388

List of values

[2, 6, 14, 32, 66, 140, 282, 574, 1156, 2326, 4654, 9348, 18698, 37436, 74904, 149896, 299794, 599780, 1199562, 2399448, 4798996, 9598556, 19197114, 38395584, 76791200, 153584626, 307169622, 614343808, 1228687618, 2457384892, 4914769786, 9829557516, 19659116482, 39318268388]

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

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