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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.

A113049 Triangle of sums of Jacobsthal numbers related to binomial(4n,n)/(3n+1) mod 4.

Table of values

n a(n)
0 3
1 11
2 13
3 43
4 45
5 53
6 171
7 173
8 181
9 213
10 683
11 685
12 693
13 725
14 853
15 2731
16 2733
17 2741
18 2773
19 2901
20 3413
21 10923
22 10925
23 10933
24 10965
25 11093
26 11605
27 13653
28 43691
29 43693
30 43701
31 43733
32 43861
33 44373
34 46421
35 54613
36 174763
37 174765
38 174773
39 174805
40 174933

List of values

[3, 11, 13, 43, 45, 53, 171, 173, 181, 213, 683, 685, 693, 725, 853, 2731, 2733, 2741, 2773, 2901, 3413, 10923, 10925, 10933, 10965, 11093, 11605, 13653, 43691, 43693, 43701, 43733, 43861, 44373, 46421, 54613, 174763, 174765, 174773, 174805, 174933]

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

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