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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A321114 Number of permutations p of [n] such that in 0p the largest up-jump equals seven and no down-jump is larger than 2.

Original entry on oeis.org

74, 528, 3550, 23284, 151096, 974472, 6252218, 39892080, 253727936, 1611713082, 10230277342, 64911693746, 411813289010, 2612751224650, 16579665387410, 105238154698686, 668214471729004, 4244427360639456, 26970709343926262, 171451330997483406, 1090351846894142818
Offset: 7

Views

Author

Alois P. Heinz, Oct 27 2018

Keywords

Crossrefs

Column k=7 of A291680.

Programs

  • Maple
    b:= proc(u, o, k) option remember; `if`(u+o=0, 1,
          add(b(u-j, o+j-1, k), j=1..min(2, u))+
          add(b(u+j-1, o-j, k), j=1..min(k, o)))
        end:
    a:= n-> (k-> b(0, n, k)-b(0, n, k-1))(7):
    seq(a(n), n=7..30);

A321115 Number of permutations p of [n] such that in 0p the largest up-jump equals eight and no down-jump is larger than 2.

Original entry on oeis.org

218, 1672, 11840, 80724, 540122, 3577200, 23538730, 154134422, 1004867492, 6532643538, 42400841816, 274916251180, 1781266093356, 11536471789526, 74699007947826, 483632170943926, 3131266103627660, 20275073235017968, 131300482646184366, 850449366760216588
Offset: 8

Views

Author

Alois P. Heinz, Oct 27 2018

Keywords

Crossrefs

Column k=8 of A291680.

Programs

  • Maple
    b:= proc(u, o, k) option remember; `if`(u+o=0, 1,
          add(b(u-j, o+j-1, k), j=1..min(2, u))+
          add(b(u+j-1, o-j, k), j=1..min(k, o)))
        end:
    a:= n-> (k-> b(0, n, k)-b(0, n, k-1))(8):
    seq(a(n), n=8..30);

A321116 Number of permutations p of [n] such that in 0p the largest up-jump equals nine xx and no down-jump is larger than 2.

Original entry on oeis.org

672, 5454, 40272, 283688, 1948408, 13188482, 88469166, 589852620, 3914957358, 25886899652, 170722453774, 1123938295984, 7390061858416, 48546948619410, 318711158282218, 2091405520367970, 13719823343200698, 89986405527666712, 590148303249975384
Offset: 9

Views

Author

Alois P. Heinz, Oct 27 2018

Keywords

Crossrefs

Column k=9 of A291680.

Programs

  • Maple
    b:= proc(u, o, k) option remember; `if`(u+o=0, 1,
          add(b(u-j, o+j-1, k), j=1..min(2, u))+
          add(b(u+j-1, o-j, k), j=1..min(k, o)))
        end:
    a:= n-> (k-> b(0, n, k)-b(0, n, k-1))(9):
    seq(a(n), n=9..30);

A321117 Number of permutations p of [n] such that in 0p the largest up-jump equals ten and no down-jump is larger than 2.

Original entry on oeis.org

2126, 18094, 138568, 1004762, 7065186, 48767474, 332656900, 2251145590, 15147986104, 101498413174, 677767802220, 4514436576522, 30014218133762, 199270720886422, 1321592750970506, 8757889640855800, 58000722621872304, 383941464541725814, 2540655228539643752
Offset: 10

Views

Author

Alois P. Heinz, Oct 27 2018

Keywords

Crossrefs

Column k=10 of A291680.

Programs

  • Maple
    b:= proc(u, o, k) option remember; `if`(u+o=0, 1,
          add(b(u-j, o+j-1, k), j=1..min(2, u))+
          add(b(u+j-1, o-j, k), j=1..min(k, o)))
        end:
    a:= n-> (k-> b(0, n, k)-b(0, n, k-1))(10):
    seq(a(n), n=10..30);
Previous Showing 11-14 of 14 results.