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 1-10 of 10 results.

A075202 Number of polyominoes with n cells that tile the plane by 180-degree rotation (Conway criterion).

Original entry on oeis.org

1, 1, 2, 5, 12, 35, 101, 320, 960, 2701, 6164, 19770, 34918, 94023, 232714, 462463, 770010, 2462890, 3247171, 9756012, 18463420, 32963374, 51599559, 177923609, 236127160
Offset: 1

Views

Author

Joseph Myers, Sep 08 2002

Keywords

References

  • Branko Grünbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Section 9.4.

Links

Crossrefs

Cf. A054359, A075198, A075199, A075200, A075201, A075203, A075204, A075205, A075206, A075211, A075220.

Extensions

More terms from Joseph Myers, Nov 04 2003
a(24) and a(25) from Joseph Myers, Nov 17 2010

A075211 Number of polyhexes with n cells that tile the plane by 180-degree rotation (Conway criterion).

Original entry on oeis.org

1, 1, 3, 7, 21, 75, 256, 929, 3090, 9235, 21216, 80463, 138623, 423595, 1160355, 2456117, 4272856, 15986299, 21709209, 75452662, 156068738
Offset: 1

Views

Author

Joseph Myers, Sep 08 2002

Keywords

References

  • Branko Grünbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Section 9.4.

Links

Crossrefs

Cf. A070766, A075207, A075208, A075209, A075210, A075212, A075213, A075214, A075215, A075202, A075220.

Extensions

More terms from Joseph Myers, Nov 08 2003
a(20) and a(21) from Joseph Myers, Nov 21 2010

A075216 Number of polyiamonds with 2n cells that tile the plane by translation.

Original entry on oeis.org

1, 2, 8, 24, 62, 291, 539, 2625, 6177, 21923, 37721, 238267, 299203, 1338140, 3492733
Offset: 1

Views

Author

Joseph Myers, Sep 08 2002

Keywords

Comments

Polyiamonds with an odd number of cells have different numbers of triangles with the two orientations and so cannot tile by translation.

References

  • Branko Grünbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Section 9.4.

Links

Crossrefs

Cf. A071332, A075217, A075218, A075219, A075220, A075221, A075222, A075223, A075224, A075198, A075207.

Extensions

More terms from Joseph Myers, Nov 11 2003
a(15) (30-iamonds) from Joseph Myers, Nov 21 2010

A075217 Number of polyiamonds with 2n cells that tile the plane by translation but not by 180-degree rotation (Conway criterion).

Original entry on oeis.org

0, 0, 0, 0, 1, 22, 38, 504, 1468, 6945, 11046, 115186, 119496, 677774, 2013619
Offset: 1

Views

Author

Joseph Myers, Sep 08 2002

Keywords

Comments

Polyiamonds with an odd number of cells have different numbers of triangles with the two orientations and so cannot tile by translation.

References

  • Branko Grünbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Section 9.4.

Links

Crossrefs

Cf. A071332, A075216, A075218, A075219, A075220, A075221, A075222, A075223, A075224, A075199, A075208.

Extensions

More terms from Joseph Myers, Nov 11 2003
a(15) (30-iamonds) from Joseph Myers, Nov 21 2010

A075218 Number of polyiamonds with 2n cells that tile the plane both by translation and by 180-degree rotation (Conway criterion).

Original entry on oeis.org

1, 2, 8, 24, 61, 269, 501, 2121, 4709, 14978, 26675, 123081, 179707, 660366, 1479114
Offset: 1

Views

Author

Joseph Myers, Sep 08 2002

Keywords

Comments

Polyiamonds with an odd number of cells have different numbers of triangles with the two orientations and so cannot tile by translation.

References

  • Branko Grünbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Section 9.4.

Links

Crossrefs

Cf. A071332, A075216, A075217, A075219, A075220, A075221, A075222, A075223, A075224, A075200, A075209.

Extensions

More terms from Joseph Myers, Nov 11 2003
a(15) (30-iamonds) from Joseph Myers, Nov 21 2010

A075219 Number of polyiamonds with n cells that tile the plane by 180-degree rotation (Conway criterion) but not by translation.

Original entry on oeis.org

1, 0, 1, 1, 4, 4, 21, 32, 111, 200, 462, 1162, 1875, 4195, 9410, 17978, 24034, 73175, 79925, 251808, 358096, 631919, 796571, 3104082, 2980476, 6088310, 10167660, 23661369, 21477012, 84485584
Offset: 1

Views

Author

Joseph Myers, Sep 08 2002

Keywords

References

  • Branko Grünbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Section 9.4.

Links

Crossrefs

Cf. A071332, A075216, A075217, A075218, A075220, A075221, A075222, A075223, A075224, A075201, A075210.

Extensions

More terms from Joseph Myers, Nov 11 2003
a(29) and a(30) from Joseph Myers, Nov 21 2010

A075221 Number of polyiamonds with n cells that tile the plane by translation or by 180-degree rotation (Conway criterion).

Original entry on oeis.org

1, 1, 1, 3, 4, 12, 21, 56, 111, 262, 462, 1453, 1875, 4734, 9410, 20603, 24034, 79352, 79925, 273731, 358096, 669640, 796571, 3342349, 2980476, 6387513, 10167660, 24999509, 21477012, 87978317
Offset: 1

Views

Author

Joseph Myers, Sep 08 2002

Keywords

References

  • Branko Grünbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Section 9.4.

Links

Crossrefs

Cf. A071332, A075216, A075217, A075218, A075219, A075220, A075222, A075223, A075224, A075203, A075212.

Extensions

More terms from Joseph Myers, Nov 11 2003
a(29) and a(30) from Joseph Myers, Nov 21 2010

A075222 Number of polyiamonds with n cells that tile the plane isohedrally but not by translation or by 180-degree rotation (Conway criterion).

Original entry on oeis.org

0, 0, 0, 0, 0, 0, 2, 10, 22, 54, 52, 534, 523, 1339, 3218, 9315, 2177, 29426, 15423, 101314, 140072, 110794, 46748, 1639279, 710736, 970251, 3002062, 8462256, 895291, 29458807
Offset: 1

Views

Author

Joseph Myers, Sep 08 2002

Keywords

Comments

A tiling is isohedral if the symmetries of the tiling act transitively on the tiles; a shape is anisohedral if it tiles the plane, but not isohedrally.

References

  • Branko Grünbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Section 9.4.

Links

Crossrefs

Cf. A071332, A075216, A075217, A075218, A075219, A075220, A075221, A075223, A075224, A075204, A075213.

Extensions

More terms from Joseph Myers, Nov 11 2003
a(29) and a(30) from Joseph Myers, Nov 21 2010

A075223 Number of polyiamonds with n cells that tile the plane isohedrally.

Original entry on oeis.org

1, 1, 1, 3, 4, 12, 23, 66, 133, 316, 514, 1987, 2398, 6073, 12628, 29918, 26211, 108778, 95348, 375045, 498168, 780434, 843319, 4981628, 3691212, 7357764, 13169722, 33461765, 22372303, 117437124
Offset: 1

Views

Author

Joseph Myers, Sep 08 2002

Keywords

Comments

A tiling is isohedral if the symmetries of the tiling act transitively on the tiles; a shape is anisohedral if it tiles the plane, but not isohedrally.

References

  • Branko Grünbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Section 9.4.

Links

Crossrefs

Cf. A071332, A075216, A075217, A075218, A075219, A075220, A075221, A075222, A075224, A075205, A075214.

Extensions

More terms from Joseph Myers, Nov 11 2003
a(29) and a(30) from Joseph Myers, Nov 21 2010

A075224 Number of anisohedral polyiamonds with n cells.

Original entry on oeis.org

0, 0, 0, 0, 0, 0, 0, 0, 6, 25, 53, 47, 97, 281, 280, 343, 345, 1367, 619, 2478, 1504, 8292, 1811, 16742, 3458, 48453, 5459, 95311, 9416, 333739
Offset: 1

Views

Author

Joseph Myers, Sep 08 2002

Keywords

Comments

A tiling is isohedral if the symmetries of the tiling act transitively on the tiles; a shape is anisohedral if it tiles the plane, but not isohedrally.

References

  • Branko Grünbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Section 9.4.

Links

Crossrefs

Cf. A071332, A075216, A075217, A075218, A075219, A075220, A075221, A075222, A075223, A075206, A075215.

Extensions

More terms from Joseph Myers, Nov 11 2003
a(29) and a(30) from Joseph Myers, Nov 21 2010
Showing 1-10 of 10 results.

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