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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.

A001317 Sierpiński's triangle (Pascal's triangle mod 2) converted to decimal.

Table of values

n a(n)
0 1
1 3
2 5
3 15
4 17
5 51
6 85
7 255
8 257
9 771
10 1285
11 3855
12 4369
13 13107
14 21845
15 65535
16 65537
17 196611
18 327685
19 983055
20 1114129
21 3342387
22 5570645
23 16711935
24 16843009
25 50529027
26 84215045
27 252645135
28 286331153
29 858993459
30 1431655765
31 4294967295
32 4294967297
33 12884901891
34 21474836485
35 64424509455
36 73014444049
37 219043332147
38 365072220245
39 1095216660735
40 1103806595329
41 3311419785987

List of values

[1, 3, 5, 15, 17, 51, 85, 255, 257, 771, 1285, 3855, 4369, 13107, 21845, 65535, 65537, 196611, 327685, 983055, 1114129, 3342387, 5570645, 16711935, 16843009, 50529027, 84215045, 252645135, 286331153, 858993459, 1431655765, 4294967295, 4294967297, 12884901891, 21474836485, 64424509455, 73014444049, 219043332147, 365072220245, 1095216660735, 1103806595329, 3311419785987]

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

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