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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.

A203424 Reciprocal of Vandermonde determinant of (1/2,1/4,...,1/(2n)).

Table of values

n a(n)
1 1
2 -4
3 -144
4 73728
5 737280000
6 -183458856960000
7 -1381360067999170560000
8 370806019753548356895375360000
9 4086267719027580129096614223921807360000
10 -2092169072142121026097466482647965368320000000000000

List of values

[1, -4, -144, 73728, 737280000, -183458856960000, -1381360067999170560000, 370806019753548356895375360000, 4086267719027580129096614223921807360000, -2092169072142121026097466482647965368320000000000000]

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

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