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.

A155216 Number of decompositions of positive even numbers 2n into unordered sums of a prime and a prime or semiprime (Chen's partitions).

Table of values

n a(n)
1 0
2 1
3 2
4 2
5 2
6 3
7 3
8 4
9 3
10 4
11 5
12 5
13 6
14 7
15 4
16 6
17 6
18 7
19 8
20 8
21 7
22 8
23 9
24 8
25 8
26 10
27 9
28 10
29 10
30 10
31 13
32 11
33 10
34 12
35 11
36 12
37 12
38 14
39 12
40 13
41 14
42 13
43 13
44 15
45 13
46 15
47 15
48 17
49 16
50 15
51 15
52 15
53 16
54 18
55 16
56 16
57 18
58 17
59 19
60 17
61 20
62 19
63 19
64 18
65 18
66 20
67 19
68 20
69 21
70 20
71 18
72 22
73 21
74 22
75 20
76 23
77 19
78 22

List of values

[0, 1, 2, 2, 2, 3, 3, 4, 3, 4, 5, 5, 6, 7, 4, 6, 6, 7, 8, 8, 7, 8, 9, 8, 8, 10, 9, 10, 10, 10, 13, 11, 10, 12, 11, 12, 12, 14, 12, 13, 14, 13, 13, 15, 13, 15, 15, 17, 16, 15, 15, 15, 16, 18, 16, 16, 18, 17, 19, 17, 20, 19, 19, 18, 18, 20, 19, 20, 21, 20, 18, 22, 21, 22, 20, 23, 19, 22]

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

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