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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.

A373754 a(n) = A205497(2*n, n - 1). The central coefficients of the Eulerian zig-zag polynomials.

Table of values

n a(n)
0 1
1 1
2 3
3 31
4 623
5 20641
6 1019051
7 70148989
8 6421463423
9 754405836811
10 110644077164479
11 19814920352425441
12 4255291684449288503
13 1079391696218976473971
14 319292229636452654327115
15 108942069149956119095870401
16 42469095372194594340983910271
17 18758916770545140042717283889713

List of values

[1, 1, 3, 31, 623, 20641, 1019051, 70148989, 6421463423, 754405836811, 110644077164479, 19814920352425441, 4255291684449288503, 1079391696218976473971, 319292229636452654327115, 108942069149956119095870401, 42469095372194594340983910271, 18758916770545140042717283889713]

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

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