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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.

A327497 a(n) = Numerator([x^n] (4*sinh(sqrt(x)/2)^2*cosh(sqrt(x)))/x).

Table of values

n a(n)
0 1
1 7
2 31
3 127
4 73
5 2047
6 8191
7 4681
8 131071
9 524287
10 42799
11 8388607
12 33554431
13 19173961
14 536870911
15 2147483647
16 53353631
17 1108378657
18 137438953471
19 78536544841
20 2199023255551
21 8796093022207
22 162139963543
23 140737488355327
24 562949953421311
25 321685687669321

List of values

[1, 7, 31, 127, 73, 2047, 8191, 4681, 131071, 524287, 42799, 8388607, 33554431, 19173961, 536870911, 2147483647, 53353631, 1108378657, 137438953471, 78536544841, 2199023255551, 8796093022207, 162139963543, 140737488355327, 562949953421311, 321685687669321]

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

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