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.

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A217808 Number of alternating permutations on 2n letters that avoid a certain pattern of length 4 (see Lewis, 2012, Appendix, for precise definition).

Original entry on oeis.org

1, 5, 42, 453, 5651, 77498, 1135828, 17485309, 279540684
Offset: 1

Views

Author

N. J. A. Sloane, Oct 12 2012

Keywords

Crossrefs

Extensions

a(7)-a(9) from Lars Blomberg, Feb 17 2018

A217809 Number of alternating permutations on 2n letters that avoid a certain pattern of length 4 (see Lewis, 2012, Appendix, for precise definition).

Original entry on oeis.org

1, 5, 42, 462, 6070, 90686, 1493962, 26584610, 503663959
Offset: 1

Views

Author

N. J. A. Sloane, Oct 13 2012

Keywords

Crossrefs

Extensions

a(7)-a(9) from Lars Blomberg, Feb 17 2018

A217810 Number of alternating permutations on 2n letters that avoid a certain pattern of length 4 (see Lewis, 2012, Appendix, for precise definition).

Original entry on oeis.org

1, 5, 42, 454, 5680, 78129
Offset: 1

Views

Author

N. J. A. Sloane, Oct 13 2012

Keywords

Crossrefs

Extensions

Data corrected by Andrew Howroyd after observation by Gionata Neri, May 02 2020

A217811 Number of alternating permutations on 2n letters that avoid a certain pattern of length 4 (see Lewis, 2012, Appendix, for precise definition).

Original entry on oeis.org

1, 5, 61, 744, 10329, 157586, 2581722, 44710952, 809508414
Offset: 1

Views

Author

N. J. A. Sloane, Oct 13 2012

Keywords

Crossrefs

Extensions

a(7)-a(9) from Lars Blomberg, Feb 17 2018

A217812 Number of alternating permutations on 2n+1 letters that avoid a certain pattern of length 5 (see Lewis, 2012, Appendix, for precise definition).

Original entry on oeis.org

1, 2, 16, 243, 5291, 144430, 4601223, 164005785, 2072049543
Offset: 0

Views

Author

N. J. A. Sloane, Oct 13 2012

Keywords

Crossrefs

Extensions

a(6)-a(8) from Lars Blomberg, Feb 22 2018

A217813 Number of alternating permutations on 2n+1 letters that avoid a certain pattern of length 5 (see Lewis, 2012, Appendix, for precise definition).

Original entry on oeis.org

1, 2, 16, 243, 5307, 146013, 4711578, 170831459, 6770004407
Offset: 0

Views

Author

N. J. A. Sloane, Oct 13 2012

Keywords

Crossrefs

Extensions

a(6)-a(8) from Lars Blomberg, Feb 22 2018

A217814 Number of alternating permutations on 2n+1 letters that avoid a certain pattern of length 5 (see Lewis, 2012, Appendix, for precise definition).

Original entry on oeis.org

1, 2, 16, 243, 5330, 148575, 4909608, 184302261, 7641026926
Offset: 0

Views

Author

N. J. A. Sloane, Oct 13 2012

Keywords

Crossrefs

Extensions

a(6)-a(8) from Lars Blomberg, Feb 22 2018

A217815 Number of alternating permutations on 2n+1 letters that avoid a certain pattern of length 5 (see Lewis, 2012, Appendix, for precise definition).

Original entry on oeis.org

1, 2, 16, 243, 5330, 148764, 4937012, 186936427, 7857183636
Offset: 0

Views

Author

N. J. A. Sloane, Oct 13 2012

Keywords

Crossrefs

Extensions

a(6)-a(8) from Lars Blomberg, Feb 22 2018

A217816 Number of alternating permutations on 2n+1 letters that avoid a certain pattern of length 5 (see Lewis, 2012, Appendix, for precise definition).

Original entry on oeis.org

1, 2, 16, 272, 6531, 194062, 6720714, 261538316, 11157463902
Offset: 0

Views

Author

N. J. A. Sloane, Oct 13 2012

Keywords

Crossrefs

Extensions

a(6)-a(8) from Lars Blomberg, Feb 22 2018

A217817 Number of alternating permutations on 2n letters that avoid a certain pattern of length 5 (see Lewis, 2012, Appendix, for precise definition).

Original entry on oeis.org

1, 5, 56, 997, 23653, 679810, 22394962, 816872290
Offset: 1

Views

Author

N. J. A. Sloane, Oct 13 2012

Keywords

Crossrefs

Extensions

a(7)-a(8) from Lars Blomberg, Feb 28 2018
Previous Showing 11-20 of 31 results. Next