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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.

A020767 Product_{k=1..n} b(k), where b(k) = binary expansion of k (A007088) but read as if it were a decimal number.

Table of values

n a(n)
0 1
1 1
2 10
3 110
4 11000
5 1111000
6 122210000
7 13565310000
8 13565310000000
9 13578875310000000
10 13714664063100000000
11 13865525367794100000000
12 15252077904573510000000000
13 16792537772935434510000000000
14 18639716927958332306100000000000
15 20708725506961707192077100000000000

List of values

[1, 1, 10, 110, 11000, 1111000, 122210000, 13565310000, 13565310000000, 13578875310000000, 13714664063100000000, 13865525367794100000000, 15252077904573510000000000, 16792537772935434510000000000, 18639716927958332306100000000000, 20708725506961707192077100000000000]

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

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