cp's OEIS Frontend

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.

User: Kamiel P.F. Verstraten

Kamiel P.F. Verstraten's wiki page.

Kamiel P.F. Verstraten has authored 2 sequences.

A238305 Triangle E(n,k), 1<=k<=n, giving the cardinality of optimal ternary covering codes of empty spheres of length n and radius k.

Original entry on oeis.org

2, 3, 3, 6, 4, 5, 14, 6, 5, 8, 27, 12, 6, 7, 12
Offset: 1

Author

Kamiel P.F. Verstraten, Feb 24 2014

Keywords

Comments

The next term is in the range 71-81.
Right diagonal is equal to A086676.

Examples

			Triangle starts:
01: 2
02: 3 3
03: 6 4 5
04: 14 6 5 8
05: 27 12 6 7 12
...
		

Crossrefs

Related to A060439, which has a code consisting of filled spheres instead of empty spheres.
Related to A230014, the triangle giving the cardinality of optimal binary covering codes of empty spheres.
See also A000983.

A230014 Triangle E(n,k), 1<=k<=n, giving the cardinality of optimal binary covering codes of empty spheres of length n and radius k.

Original entry on oeis.org

2, 2, 4, 4, 4, 8, 4, 4, 4, 16, 8, 6, 6, 8, 32, 14, 8, 6, 8, 14, 64, 24, 8, 8, 8, 8, 24, 128, 32, 16, 8, 8, 8, 16, 32, 256, 64, 24, 12, 10, 10, 12, 24, 64, 512, 124
Offset: 1

Author

Kamiel P.F. Verstraten, Feb 22 2014

Keywords

Comments

The next term is in the range 34-40.
Note that E(n,k) = E(n,n-k).

Examples

			Triangle starts:
01: 2,
02: 2, 4,
03: 4, 4, 8,
04: 4, 4, 4, 16,
05: 8, 6, 6, 8, 32,
06: 14, 8, 6, 8, 14, 64,
07: 24, 8, 8, 8, 8, 24, 128,
08: 32, 16, 8, 8, 8, 16, 32, 256,
09: 64, 24, 12, 10, 10, 12, 24, 64, 512,
10: 124, ...
		

Crossrefs

Related to A060438, which has a code consisting of filled spheres instead of empty spheres.
Related to A238305, the triangle giving the cardinality of optimal ternary covering codes of empty spheres.
The first column is equal to 2*A000983.

Extensions

a(43) corrected by Omar E. Pol, Nov 23 2014