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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.

A305693 a(n) = binomial(4*n, 2*n) - 4*n*binomial(2*n-2, n-1).

Table of values

n a(n)
0 1
1 2
2 54
3 852
4 12550
5 183356
6 2698108
7 40090728
8 600970566
9 9074671980
10 137844584020
11 2104090834456
12 32247569822364
13 495918392331992
14 7648690018326840
15 118264579157865424
16 1832624131015069254
17 28453041434367110220
18 442512540108817131364

List of values

[1, 2, 54, 852, 12550, 183356, 2698108, 40090728, 600970566, 9074671980, 137844584020, 2104090834456, 32247569822364, 495918392331992, 7648690018326840, 118264579157865424, 1832624131015069254, 28453041434367110220, 442512540108817131364]

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

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