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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.

A212267 Array A(i,j) read by antidiagonals: A(i,j) is the (2*i-1)-th derivative of tan(tan(tan(...tan(x)))) nested j times evaluated at 0.

Table of values

n a(n)
1 1
2 1
3 2
4 1
5 4
6 16
7 1
8 6
9 72
10 272
11 1
12 8
13 168
14 2896
15 7936
16 1
17 10
18 304
19 10672
20 203904
21 353792
22 1
23 12
24 480
25 26400
26 1198080
27 22112000
28 22368256
29 1
30 14
31 696
32 52880
33 4071040
34 208521728
35 3412366336
36 1903757312
37 1
38 16
39 952
40 92912
41 10373760
42 976629760
43 51874413568
44 709998153728
45 209865342976

List of values

[1, 1, 2, 1, 4, 16, 1, 6, 72, 272, 1, 8, 168, 2896, 7936, 1, 10, 304, 10672, 203904, 353792, 1, 12, 480, 26400, 1198080, 22112000, 22368256, 1, 14, 696, 52880, 4071040, 208521728, 3412366336, 1903757312, 1, 16, 952, 92912, 10373760, 976629760, 51874413568, 709998153728, 209865342976]

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

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