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.

Showing 1-1 of 1 results.

A143901 Rectangular array R by antidiagonals: R(m,n) = floor((m*n+1)/2).

Original entry on oeis.org

1, 1, 1, 2, 2, 2, 2, 3, 3, 2, 3, 4, 5, 4, 3, 3, 5, 6, 6, 5, 3, 4, 6, 8, 8, 8, 6, 4, 4, 7, 9, 10, 10, 9, 7, 4, 5, 8, 11, 12, 13, 12, 11, 8, 5, 5, 9, 12, 14, 15, 15, 14, 12, 9, 5, 6, 10, 14, 16, 18, 18, 18, 16, 14, 10, 6, 6, 11, 15, 18, 20, 21, 21, 20, 18, 15, 11, 6, 7, 12, 17, 20, 23, 24, 25, 24
Offset: 1

Views

Author

Clark Kimberling, Sep 04 2008

Keywords

Comments

Old name was: R(m,n) = number of white squares.

Examples

			Northwest corner:
1 1 2 2 3 3 4 4
1 2 3 4 5 6 7 8
2 3 5 6 8 9 11 12
2 4 6 8 10 12 14 16

Crossrefs

Cf. A143902.
Antidiagonal sums: (1,2,6,10,19,...)=A005993.
Diagonals: A000982, A000217, A007590, A000096, A116940.
Rows and columns: A004526, A000027, A007494, A005843, A047218 et al.

Extensions

Entry revised by N. J. A. Sloane, Jun 12 2015
Showing 1-1 of 1 results.

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

Content is available under The OEIS End-User License Agreement.