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.

A194497 Number of ways to arrange 7 nonattacking queens on the lower triangle of an n X n board.

Original entry on oeis.org

0, 0, 0, 0, 0, 0, 0, 0, 0, 10, 1210, 27198, 322782, 2564988, 15372702, 74615814, 306900410, 1105651074, 3569169990, 10512880400, 28628691842, 72880455042, 174895586328, 398556484840, 867314768878, 1811576604968, 3646385889888
Offset: 1

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Author

R. H. Hardin, Aug 26 2011

Keywords

Comments

Column 7 of A194498.

Examples

			Some solutions for 10 X 10:
  0                    0                    0
  0 0                  0 0                  0 0
  0 0 0                0 0 0                0 0 0
  0 1 0 0              0 1 0 0              0 0 0 1
  0 0 0 1 0            0 0 0 1 0            1 0 0 0 0
  1 0 0 0 0 0          0 0 0 0 0 1          0 0 1 0 0 0
  0 0 0 0 0 0 1        1 0 0 0 0 0 0        0 0 0 0 0 1 0
  0 0 0 0 1 0 0 0      0 0 1 0 0 0 0 0      0 1 0 0 0 0 0 0
  0 0 1 0 0 0 0 0 0    0 0 0 0 1 0 0 0 0    0 0 0 0 0 0 1 0 0
  0 0 0 0 0 1 0 0 0 0  0 0 0 0 0 0 1 0 0 0  0 0 0 0 1 0 0 0 0 0