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

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A187048 Number of 4-step one or two space at a time bishop's tours on an n X n board summed over all starting positions 0
0, 0, 24, 272, 1084, 2660, 5032, 8164, 12056, 16708, 22120, 28292, 35224, 42916, 51368, 60580, 70552, 81284, 92776, 105028, 118040, 131812, 146344, 161636, 177688, 194500, 212072, 230404, 249496, 269348, 289960, 311332, 333464, 356356, 380008 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Row 4 of A187046

LINKS

Table of n, a(n) for n=1..35.

FORMULA

Empirical: a(n) = 380*n^2 - 2568*n + 4388 for n>5

EXAMPLE

Some solutions for 4X4

..0..0..4..0....0..0..0..0....0..0..1..0....0..0..3..0....0..1..0..0

..0..0..0..3....4..0..1..0....0..3..0..0....0..2..0..0....0..0..3..0

..0..0..2..0....0..0..0..2....2..0..0..0....4..0..0..0....0..0..0..2

..0..0..0..1....0..0..3..0....0..0..0..4....0..0..0..1....4..0..0..0

CROSSREFS

Sequence in context: A022065 A125412 A270846 * A000915 A006665 A010940

Adjacent sequences:  A187045 A187046 A187047 * A187049 A187050 A187051

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 02 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 December 1 20:41 EST 2021. Contains 349435 sequences. (Running on oeis4.)