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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.

A330987 Alternatively add and half-multiply pairs of the nonnegative integers.

Table of values

n a(n)
1 1
2 3
3 9
4 21
5 17
6 55
7 25
8 105
9 33
10 171
11 41
12 253
13 49
14 351
15 57
16 465
17 65
18 595
19 73
20 741
21 81
22 903
23 89
24 1081
25 97
26 1275
27 105
28 1485
29 113
30 1711
31 121
32 1953
33 129
34 2211
35 137
36 2485
37 145
38 2775
39 153
40 3081
41 161
42 3403
43 169
44 3741
45 177
46 4095
47 185
48 4465
49 193
50 4851
51 201
52 5253
53 209

List of values

[1, 3, 9, 21, 17, 55, 25, 105, 33, 171, 41, 253, 49, 351, 57, 465, 65, 595, 73, 741, 81, 903, 89, 1081, 97, 1275, 105, 1485, 113, 1711, 121, 1953, 129, 2211, 137, 2485, 145, 2775, 153, 3081, 161, 3403, 169, 3741, 177, 4095, 185, 4465, 193, 4851, 201, 5253, 209]