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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A189848 Number of ways to place n nonattacking composite pieces rook + semi-rider[6,6] on an n X n chessboard.

Original entry on oeis.org

1, 2, 6, 24, 120, 720, 4920, 37488, 319644, 3033264, 31784280, 364902480, 4509620040, 59768680032, 847746532152
Offset: 1

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Author

Vaclav Kotesovec, Apr 29 2011

Keywords

Comments

a(n) is also number of permutations p of 1,2,...,n satisfying p(j+6k)-p(j)<>6k for all j>=1, k>=1, j+6k<=n
For information about semi-pieces see semi-bishop (A187235) and semi-queen (A099152).

Links

Crossrefs

Cf. A189285, A099152, A189843, A189844, A189846, A189847, A189842, A187235
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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