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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.

A224232 a(n) = n! if n <= 3, otherwise a(n) = 2*(a(n-1) + a(n-3)) + a(n-2).

Table of values

n a(n)
0 1
1 1
2 2
3 6
4 16
5 42
6 112
7 298
8 792
9 2106
10 5600
11 14890
12 39592
13 105274
14 279920
15 744298
16 1979064
17 5262266
18 13992192
19 37204778
20 98926280
21 263041722
22 699419280
23 1859732842
24 4944968408
25 13148508218
26 34961450528
27 92961346090
28 247181159144
29 657246565434
30 1747596982192
31 4646802848106
32 12355695809272
33 32853388431034
34 87356078367552
35 232276936784682

List of values

[1, 1, 2, 6, 16, 42, 112, 298, 792, 2106, 5600, 14890, 39592, 105274, 279920, 744298, 1979064, 5262266, 13992192, 37204778, 98926280, 263041722, 699419280, 1859732842, 4944968408, 13148508218, 34961450528, 92961346090, 247181159144, 657246565434, 1747596982192, 4646802848106, 12355695809272, 32853388431034, 87356078367552, 232276936784682]