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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.

A071968 Denominators of coefficients of expansion of arctan(x)^2 = x^2-2/3*x^4+23/45*x^6-44/105*x^8+563/1575*x^10-3254/10395*x^12+ ...

Table of values

n a(n)
0 1
1 1
2 3
3 45
4 105
5 1575
6 10395
7 315315
8 45045
9 6891885
10 72747675
11 160044885
12 1003917915
13 21751554825
14 35137127025
15 2183521465125
16 4512611027925
17 76714387474725
18 40613499251325
19 3172365552631275

List of values

[1, 1, 3, 45, 105, 1575, 10395, 315315, 45045, 6891885, 72747675, 160044885, 1003917915, 21751554825, 35137127025, 2183521465125, 4512611027925, 76714387474725, 40613499251325, 3172365552631275]

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

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