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: Alain Brobecker

Alain Brobecker's wiki page.

Alain Brobecker has authored 6 sequences.

A350041 Number of ways of placing maximum number of nonattacking rooks on a triangular board with edge-length n (symmetric solutions count only once).

Original entry on oeis.org

1, 1, 1, 1, 5, 3, 1, 45, 29, 6, 807, 422, 46, 20022, 8270, 424, 642162, 211848
Offset: 1

Views

Author

Alain Brobecker, Dec 10 2021

Keywords

Comments

The rooks placements are considered different when they cannot be obtained by a rotation and/or reflection of another solution that leaves the board inchanged. - Alain Brobecker, Dec 19 2021
a(n) = A350191(n) for n <> 10,13,16,19,... - Vaclav Kotesovec, Dec 20 2021

Links

Crossrefs

Cf. A004396, A289893, A350191.

Extensions

a(17)-a(18) from Vaclav Kotesovec, Dec 19 2021

A125529 Number of Othello shapes with unique realization at the end of the n-th ply.

Original entry on oeis.org

1, 4, 12, 52, 196, 932, 3944, 14020, 53556, 165584, 507656, 1251972, 2988984, 5904880
Offset: 0

Views

Author

Alain Brobecker, Dec 30 2006

Keywords

Links

Crossrefs

Cf. A124004, A124005, A124006.

Extensions

Edited by Charles R Greathouse IV, Oct 28 2009
a(10)-a(12) from Dominic Hofer, Mar 04 2020
a(13) from Dominic Hofer, Feb 11 2022

A125528 Number of different Othello shapes at the end of the n-th ply.

Original entry on oeis.org

1, 4, 12, 54, 220, 1130, 5568, 26966, 132037, 589652, 2601811, 10147378, 38356054, 129698048
Offset: 0

Views

Author

Alain Brobecker, Dec 30 2006

Keywords

Links

Crossrefs

Cf. A124004, A124005, A124006.

Extensions

Edited by Charles R Greathouse IV, Oct 28 2009
a(10)-a(12) from Dominic Hofer, Mar 04 2020
a(13) from Dominic Hofer, Feb 11 2022

A124005 Number of different Othello positions at the end of the n-th ply.

Original entry on oeis.org

1, 4, 12, 54, 236, 1288, 7092, 42614, 269352, 1743560, 11922442, 80209268, 562280115, 3772081046
Offset: 0

Views

Author

Alain Brobecker (abrobecker(AT)yahoo.com), Nov 01 2006, Dec 30 2006

Keywords

Links

Crossrefs

Cf. A124004, A124006.

Extensions

Edited by Charles R Greathouse IV, Oct 28 2009
a(10) from Dominic Hofer, Mar 28 2018
a(11)-a(13) from Dominic Hofer, Sep 28 2019

A124004 Number of possible Reversi games at the end of the n-th ply.

Original entry on oeis.org

1, 4, 12, 56, 244, 1396, 8200, 55092, 390216, 3005288, 24571056, 212258216, 1939879668, 18429618408, 184041761768, 1891831332208, 20301171282452, 222742563853912, 2534535926617852, 29335558770589276, 349980362625040712, 4228388321175157140
Offset: 0

Views

Author

Alain Brobecker (abrobecker(AT)yahoo.com), Nov 01 2006, Dec 30 2006

Keywords

Comments

Reversi is the older name for the game. Othello is a more recent trade name.

Links

Crossrefs

Cf. A124005, A124006.

Extensions

a(15)-a(18) from Paul Byrne, Mar 08 2008
Edited by Charles R Greathouse IV, Oct 28 2009
a(19) from Dominic Hofer, Oct 21 2014
a(20) from Dominic Hofer, Jan 11 2021
a(21) from Dominic Hofer, Feb 11 2021

A124006 Number of Othello positions with unique realization at the end of the n-th ply.

Original entry on oeis.org

1, 4, 12, 52, 228, 1192, 6160, 33344, 191380, 1072232, 6416600, 35990544, 212278256, 1145811772
Offset: 0

Views

Author

Alain Brobecker, Nov 01 2006

Keywords

Links

Crossrefs

Cf. A124004, A124005.

Extensions

a(8)-a(9) from Alain Brobecker, Dec 30 2006
Edited by Charles R Greathouse IV, Oct 28 2009
a(10)-a(12) from Dominic Hofer, Sep 27 2019
a(13) from Dominic Hofer, Feb 11 2022

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

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