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A187156 Number of 3-step one space at a time bishop's tours on an n X n board summed over all starting positions 2
0, 0, 20, 64, 132, 224, 340, 480, 644, 832, 1044, 1280, 1540, 1824, 2132, 2464, 2820, 3200, 3604, 4032, 4484, 4960, 5460, 5984, 6532, 7104, 7700, 8320, 8964, 9632, 10324, 11040, 11780, 12544, 13332, 14144, 14980, 15840, 16724, 17632, 18564, 19520, 20500 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Row 3 of A187155

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..50

FORMULA

Empirical: a(n) = 12*n^2 - 40*n + 32 for n>1

EXAMPLE

Some solutions for 4X4

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

..0..0..2..0....0..2..0..0....0..2..0..0....0..0..2..0....0..0..2..0

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

..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0

CROSSREFS

Sequence in context: A117432 A033577 A262486 * A246877 A074632 A225190

Adjacent sequences:  A187153 A187154 A187155 * A187157 A187158 A187159

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 06 2011

STATUS

approved

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Last modified August 23 13:42 EDT 2017. Contains 291004 sequences.