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.

Showing 1-3 of 3 results.

A210988 Number of one-sided polyominoes with 2n cells.

Original entry on oeis.org

1, 7, 60, 704, 9189, 126759, 1802312, 26152418, 385221143, 5741256764, 86383382827, 1309998125640, 19998172734786, 307022182222506, 4736694001644862, 73390033697855860, 1141388483146794007, 17810678207278478530
Offset: 1

Views

Author

Omar E. Pol, Sep 16 2012

Keywords

Comments

Sequence related with polydominoes and other similar sequences. It appears that we can write A216492(n) < A216583(n) < A056785(n) < A056786(n) < A210996(n) < a(n) < A210986(n), if n >= 3. - Omar E. Pol, Sep 16 2012

Links

Crossrefs

Bisection of A000988.
Cf. A210989, A210996.

A210997 Number of free polyominoes with 2n-1 cells.

Original entry on oeis.org

1, 2, 12, 108, 1285, 17073, 238591, 3426576, 50107909, 742624232, 11123060678, 168047007728, 2557227044764, 39153010938487, 602621953061978, 9317706529987950, 144648268175306702, 2253491528465905342, 35218318816847951974
Offset: 1

Views

Author

Omar E. Pol, Sep 15 2012

Keywords

Links

Crossrefs

Bisection of A000105.
Cf. A000988, A210989, A210996.

A210987 Number of fixed polyominoes with 2n-1 cells.

Original entry on oeis.org

1, 6, 63, 760, 9910, 135268, 1903890, 27394666, 400795844, 5940738676, 88983512783, 1344372335524, 20457802016011, 313224032098244, 4820975409710116, 74541651404935148, 1157186142148293638, 18027932215016128134
Offset: 1

Views

Author

Omar E. Pol, Sep 16 2012

Keywords

Links

Crossrefs

Bisection of A001168.
Cf. A210986, A210989, A210997.

Formula

a(n) = A001168(2*n-1).
Showing 1-3 of 3 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.