login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Please make a donation to keep the OEIS running. We are now in our 56th year. In the past year we added 10000 new sequences and reached almost 9000 citations (which often say "discovered thanks to the OEIS").
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A185056 Number of ways to place n nonattacking composite pieces bishop + semi-rook on an n X n board. 0
1, 2, 5, 24, 125, 796, 5635, 48042, 453947, 4834872, 56433455, 727449366, 10099103269, 152097526360, 2449915208271, 42295879864692 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Two semi-rooks do not attack each other if they are in the same column.

LINKS

Table of n, a(n) for n=1..16.

V. Kotesovec, Non-attacking chess pieces

CROSSREFS

Cf. A088789, A187235, A002465, A099152, A000170.

Sequence in context: A284230 A052111 A176473 * A330512 A194349 A208969

Adjacent sequences:  A185053 A185054 A185055 * A185057 A185058 A185059

KEYWORD

nonn,hard

AUTHOR

Vaclav Kotesovec, Dec 22 2011

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 29 19:26 EST 2020. Contains 338769 sequences. (Running on oeis4.)