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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.

A316661 a(n) = ceiling(sqrt((2*n)^n)).

Table of values

n a(n)
0 1
1 2
2 4
3 15
4 64
5 317
6 1728
7 10268
8 65536
9 445376
10 3200000
11 24172677
12 191102976
13 1575167570
14 13492928512
15 119786923327
16 1099511627776
17 10412878353557
18 101559956668416
19 1018460448140641
20 10485760000000000
21 110692335104026964
22 1196683881290399744

List of values

[1, 2, 4, 15, 64, 317, 1728, 10268, 65536, 445376, 3200000, 24172677, 191102976, 1575167570, 13492928512, 119786923327, 1099511627776, 10412878353557, 101559956668416, 1018460448140641, 10485760000000000, 110692335104026964, 1196683881290399744]

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

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