A217805
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, 444, 5337, 69657, 962939, 13890083, 207042035
Offset: 1
A217806
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, 4, 28, 260, 2844, 34564, 451868, 6231556, 89510428
Offset: 1
A217807
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, 4, 29, 292, 3620, 51866, 827415, 14350467, 266218320
Offset: 1
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
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
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
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
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
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
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