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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.

A006307 Number of ways writing 2^n as unordered sums of 2 primes.

Table of values

n a(n)
0 0
1 0
2 1
3 1
4 2
5 2
6 5
7 3
8 8
9 11
10 22
11 25
12 53
13 76
14 151
15 244
16 435
17 749
18 1314
19 2367
20 4239
21 7471
22 13705
23 24928
24 45746
25 83467
26 153850
27 283746
28 525236
29 975685
30 1817111
31 3390038
32 6341424
33 11891654
34 22336060
35 42034097
36 79287664
37 149711134
38 283277225
39 536710100
40 1018369893

List of values

[0, 0, 1, 1, 2, 2, 5, 3, 8, 11, 22, 25, 53, 76, 151, 244, 435, 749, 1314, 2367, 4239, 7471, 13705, 24928, 45746, 83467, 153850, 283746, 525236, 975685, 1817111, 3390038, 6341424, 11891654, 22336060, 42034097, 79287664, 149711134, 283277225, 536710100, 1018369893]

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

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