cp's OEIS Frontend

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.

A261398 Integer coefficients arising from a formula for Sum_{m>=1} sin(Pi*m/3)^2/m^2.

Table of values

n a(n)
1 1
2 2
3 6
4 32
5 230
6 2112
7 23548
8 309248
9 4675014
10 79969280
11 1527092468
12 32203259904
13 743288515164
14 18638209056768
15 504541774904760
16 14664951970922496
17 455522635895576646
18 15058911973677465600
19 527896878148304296900
20 19559986314930028544000
21 763820398700983273655796
22 31353195811771939838492672

List of values

[1, 2, 6, 32, 230, 2112, 23548, 309248, 4675014, 79969280, 1527092468, 32203259904, 743288515164, 18638209056768, 504541774904760, 14664951970922496, 455522635895576646, 15058911973677465600, 527896878148304296900, 19559986314930028544000, 763820398700983273655796, 31353195811771939838492672]

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

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