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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.

A224704 Number of stacks of n triangles, pointing upwards or downwards depending on row parity.

Table of values

n a(n)
0 1
1 1
2 1
3 2
4 4
5 7
6 13
7 24
8 45
9 84
10 156
11 291
12 543
13 1013
14 1889
15 3524
16 6575
17 12266
18 22883
19 42691
20 79647
21 148593
22 277221
23 517197
24 964911
25 1800189
26 3358526
27 6265846
28 11689902
29 21809313
30 40688632
31 75910917
32 141623529
33 264220545
34 492944193
35 919663462
36 1715774125

List of values

[1, 1, 1, 2, 4, 7, 13, 24, 45, 84, 156, 291, 543, 1013, 1889, 3524, 6575, 12266, 22883, 42691, 79647, 148593, 277221, 517197, 964911, 1800189, 3358526, 6265846, 11689902, 21809313, 40688632, 75910917, 141623529, 264220545, 492944193, 919663462, 1715774125]

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

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