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.

A049827 a(n) = T(2n-1,n)+T(2n,n+1)+...+T(3n-3,2n-2) = sum over a period of n-th diagonal of array T given by A049816.

Table of values

n a(n)
1 0
2 1
3 3
4 6
5 8
6 13
7 13
8 20
9 22
10 25
11 27
12 38
13 32
14 45
15 45
16 46
17 50
18 63
19 59
20 74
21 64
22 71
23 77
24 96
25 78
26 93
27 99
28 102
29 100
30 125
31 101
32 132
33 122
34 129
35 139
36 136
37 128
38 161
39 157
40 162
41 150
42 187
43 155
44 198
45 176
46 177
47 197
48 224
49 186
50 213
51 211
52 220
53 216
54 257
55 221
56 238
57 222
58 249

List of values

[0, 1, 3, 6, 8, 13, 13, 20, 22, 25, 27, 38, 32, 45, 45, 46, 50, 63, 59, 74, 64, 71, 77, 96, 78, 93, 99, 102, 100, 125, 101, 132, 122, 129, 139, 136, 128, 161, 157, 162, 150, 187, 155, 198, 176, 177, 197, 224, 186, 213, 211, 220, 216, 257, 221, 238, 222, 249]

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

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