

A005634


Bishops on an n X n board (see Robinson paper for details).
(Formerly M3621)


1



0, 0, 1, 4, 28, 85, 630, 3096, 23220, 123952, 1036080, 7230828, 66349440, 500721252, 5080269600, 45925520096, 508031496000, 4919774752448, 59256847036800, 656763354386032, 8532986691801600, 100525956801641104, 1405335512577427200, 18431883446961030912
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OFFSET

2,4


REFERENCES

R. W. Robinson, Counting arrangements of bishops, pp. 198214 of Combinatorial Mathematics IV (Adelaide 1975), Lect. Notes Math., 560 (1976). [The sequence epsilon(n).]
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).


LINKS

Table of n, a(n) for n=2..25.
R. W. Robinson, Counting arrangements of bishops, pp. 198214 of Combinatorial Mathematics IV (Adelaide 1975), Lect. Notes Math., 560 (1976). (Annotated scanned copy)


MAPLE

For Maple program see A005635.


CROSSREFS

Sequence in context: A085001 A153784 A030117 * A183485 A183437 A294315
Adjacent sequences: A005631 A005632 A005633 * A005635 A005636 A005637


KEYWORD

nonn


AUTHOR

N. J. A. Sloane.


EXTENSIONS

More terms from N. J. A. Sloane, Sep 28 2006


STATUS

approved



