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.

Previous Showing 11-14 of 14 results.

A305606 Number of blunt polytans (polyaboloes) with n cells, identifying mirror images. A blunt polytan is one with no acute corners.

Original entry on oeis.org

0, 1, 0, 2, 2, 5, 6, 23, 45, 138, 347, 1007, 2751, 7998, 22638, 65708, 189505, 551798, 1606383, 4697905
Offset: 1

Views

Author

George Sicherman, Jun 05 2018

Keywords

Examples

			There are 3 ditans.  Only the square ditan lacks acute corners, so a(2)=1.

Links

Crossrefs

Cf. A006074, number of polyaboloes with n cells, identifying mirror images.

Extensions

a(15)-a(20) from John Mason, Jan 07 2022

A350580 Number of n-celled polytans with holes.

Original entry on oeis.org

0, 0, 0, 0, 0, 0, 2, 11, 76, 422, 2187, 10625, 49381, 221738, 969583, 4153567
Offset: 1

Views

Author

John Mason, Jan 07 2022

Keywords

Crossrefs

Cf. A006074, A001419.

A354403 Number of one-sided pseudo-polytans with n cells.

Original entry on oeis.org

1, 15, 171, 2799, 46933, 831358, 15085844, 279317154, 5247744254
Offset: 1

Views

Author

Aaron N. Siegel, May 25 2022

Keywords

Comments

As A354380, but with mirror-image figures counted as distinct.

Crossrefs

Cf. A354380, A006074, A151519.

A354405 Number of fixed pseudo-polytans with n cells.

Original entry on oeis.org

4, 47, 684, 11010, 187732, 3322341, 60343376, 1117211474, 20990977016
Offset: 1

Views

Author

Aaron N. Siegel, May 25 2022

Keywords

Crossrefs

Cf. A354380, A006074, A353978.
Previous Showing 11-14 of 14 results.

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

Content is available under The OEIS End-User License Agreement.