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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.

A136807 Hankel transform of double factorial numbers n!*2^n=A000165(n).

Table of values

n a(n)
0 1
1 4
2 256
3 589824
4 86973087744
5 1282470362637926400
6 2723154477021188283432960000
7 1133321924829207204666583887642624000000
8 120746421332702772771144114237731253721340313600000000

List of values

[1, 4, 256, 589824, 86973087744, 1282470362637926400, 2723154477021188283432960000, 1133321924829207204666583887642624000000, 120746421332702772771144114237731253721340313600000000]

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

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