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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.

A118023 Column 0 of triangle A118022, where the matrix square of A118022 shifts each column up 1 row, dropping the main diagonal of powers of 2.

Table of values

n a(n)
0 1
1 1
2 3
3 19
4 243
5 6227
6 319251
7 32737427
8 6714170259
9 2754046149011
10 2259333156408723
11 3706972573115098515
12 12164337831474297132435
13 79833941280970262512121235
14 1047892334589811621056371520915

List of values

[1, 1, 3, 19, 243, 6227, 319251, 32737427, 6714170259, 2754046149011, 2259333156408723, 3706972573115098515, 12164337831474297132435, 79833941280970262512121235, 1047892334589811621056371520915]

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

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