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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.

A126156 Expansion of e.g.f. sqrt(sec(sqrt(2)*x)), showing coefficients of only the even powers of x.

Table of values

n a(n)
0 1
1 1
2 7
3 139
4 5473
5 357721
6 34988647
7 4784061619
8 871335013633
9 203906055033841
10 59618325600871687
11 21297483077038703899
12 9127322584507530151393
13 4621897483978366951337161
14 2730069675607609356178641127
15 1860452328661957054823447670979
16 1448802510679254790311316267306753

List of values

[1, 1, 7, 139, 5473, 357721, 34988647, 4784061619, 871335013633, 203906055033841, 59618325600871687, 21297483077038703899, 9127322584507530151393, 4621897483978366951337161, 2730069675607609356178641127, 1860452328661957054823447670979, 1448802510679254790311316267306753]

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

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