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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.

A157004 Transform of central binomial coefficients A000984 whose Hankel transform obeys a Somos-4 recurrence.

Table of values

n a(n)
0 1
1 2
2 6
3 18
4 58
5 192
6 650
7 2232
8 7746
9 27096
10 95376
11 337404
12 1198546
13 4272308
14 15273888
15 54744268
16 196646922
17 707747988
18 2551624304
19 9213416524
20 33313656888
21 120604436624
22 437112790668
23 1585877246424
24 5759085911154

List of values

[1, 2, 6, 18, 58, 192, 650, 2232, 7746, 27096, 95376, 337404, 1198546, 4272308, 15273888, 54744268, 196646922, 707747988, 2551624304, 9213416524, 33313656888, 120604436624, 437112790668, 1585877246424, 5759085911154]

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

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