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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.

A098278 D(n,0)/2^n, where D(n,x) is triangle A098277.

Table of values

n a(n)
0 1
1 1
2 3
3 21
4 267
5 5349
6 154923
7 6120741
8 316271787
9 20701782309
10 1673934058923
11 163850823271461
12 19093313058395307
13 2611858473935397669
14 414452507370456337323
15 75508557963926980473381

List of values

[1, 1, 3, 21, 267, 5349, 154923, 6120741, 316271787, 20701782309, 1673934058923, 163850823271461, 19093313058395307, 2611858473935397669, 414452507370456337323, 75508557963926980473381]

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

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