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.

Previous Showing 11-14 of 14 results.

A287257 Number of set partitions of [n] such that all absolute differences between least elements of consecutive blocks are <= seven.

Original entry on oeis.org

1, 1, 2, 5, 15, 52, 203, 877, 4140, 21146, 115843, 675473, 4168497, 27104931, 185021744, 1321754226, 9855001715, 76507188271, 617104691644, 5161680552010, 44693782407111, 399989835781046, 3694733749868820, 35179653387299934, 344876641013083336
Offset: 0

Views

Author

Alois P. Heinz, May 22 2017

Keywords

Crossrefs

Column k=7 of A287216.
Cf. A000110.

Formula

a(n) = A287216(n,7).
a(n) = A000110(n) for n <= 8.

A287258 Number of set partitions of [n] such that all absolute differences between least elements of consecutive blocks are <= eight.

Original entry on oeis.org

1, 1, 2, 5, 15, 52, 203, 877, 4140, 21147, 115974, 678310, 4205230, 27497463, 188884702, 1358500111, 10201272170, 79783911418, 648489059992, 5467348769587, 47728811273817, 430751210469094, 4013169321694153, 38547034091725550, 381252702363363969
Offset: 0

Views

Author

Alois P. Heinz, May 22 2017

Keywords

Crossrefs

Column k=8 of A287216.
Cf. A000110.

Formula

a(n) = A287216(n,8).
a(n) = A000110(n) for n <= 9.

A287259 Number of set partitions of [n] such that all absolute differences between least elements of consecutive blocks are <= nine.

Original entry on oeis.org

1, 1, 2, 5, 15, 52, 203, 877, 4140, 21147, 115975, 678569, 4213081, 27621156, 190402182, 1375129039, 10374133545, 81541494757, 666269176903, 5648127595636, 49587725282894, 450158439775999, 4219372853286578, 40779812327165914, 405907919759151220
Offset: 0

Views

Author

Alois P. Heinz, May 22 2017

Keywords

Crossrefs

Column k=9 of A287216.
Cf. A000110.

Formula

a(n) = A287216(n,9).
a(n) = A000110(n) for n <= 10.

A287260 Number of set partitions of [n] such that all absolute differences between least elements of consecutive blocks are <= ten.

Original entry on oeis.org

1, 1, 2, 5, 15, 52, 203, 877, 4140, 21147, 115975, 678570, 4213596, 27643409, 190833091, 1381223515, 10448641031, 82388624090, 675565642030, 5748668560311, 50672729373781, 461933478903121, 4348527928700455, 42216300909368230, 422143264687282845
Offset: 0

Views

Author

Alois P. Heinz, May 22 2017

Keywords

Crossrefs

Column k=10 of A287216.
Cf. A000110.

Formula

a(n) = A287216(n,10).
a(n) = A000110(n) for n <= 11.
Previous Showing 11-14 of 14 results.