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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.

A120777 a(n) = 2^(2*n - valuation(CatalanNumber(n), 2)).

Table of values

n a(n)
0 1
1 4
2 8
3 64
4 128
5 512
6 1024
7 16384
8 32768
9 131072
10 262144
11 2097152
12 4194304
13 16777216
14 33554432
15 1073741824
16 2147483648
17 8589934592
18 17179869184
19 137438953472
20 274877906944
21 1099511627776
22 2199023255552
23 35184372088832
24 70368744177664
25 281474976710656
26 562949953421312

List of values

[1, 4, 8, 64, 128, 512, 1024, 16384, 32768, 131072, 262144, 2097152, 4194304, 16777216, 33554432, 1073741824, 2147483648, 8589934592, 17179869184, 137438953472, 274877906944, 1099511627776, 2199023255552, 35184372088832, 70368744177664, 281474976710656, 562949953421312]

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

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