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.

A215221 Number of solutions to p(n) = Sum_{i=1..n-1} c(i)*p(i) with c(i) in {-1,0,1} and p(n) = n-th prime.

Table of values

n a(n)
1 0
2 0
3 1
4 1
5 1
6 5
7 11
8 28
9 69
10 164
11 437
12 1104
13 2887
14 7778
15 20861
16 55610
17 148857
18 408694
19 1112103
20 3059571
21 8519916
22 23586160
23 65766961
24 183122954
25 508287720
26 1423807763
27 4019399991
28 11359914488
29 32294035715
30 91866217942
31 258134484981
32 732226048291

List of values

[0, 0, 1, 1, 1, 5, 11, 28, 69, 164, 437, 1104, 2887, 7778, 20861, 55610, 148857, 408694, 1112103, 3059571, 8519916, 23586160, 65766961, 183122954, 508287720, 1423807763, 4019399991, 11359914488, 32294035715, 91866217942, 258134484981, 732226048291]

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

Content is available under The OEIS End-User License Agreement.