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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.

A278070 a(n) = hypergeometric([n, -n], [], -1).

Table of values

n a(n)
0 1
1 2
2 11
3 106
4 1457
5 25946
6 566827
7 14665106
8 438351041
9 14862109042
10 563501581931
11 23624177026682
12 1085079390005041
13 54185293223976266
14 2922842896378005707
15 169366580127359119906
16 10492171932362920604417
17 691986726674000405367266
18 48408260338825019327539531

List of values

[1, 2, 11, 106, 1457, 25946, 566827, 14665106, 438351041, 14862109042, 563501581931, 23624177026682, 1085079390005041, 54185293223976266, 2922842896378005707, 169366580127359119906, 10492171932362920604417, 691986726674000405367266, 48408260338825019327539531]

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

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