OFFSET
1,5
COMMENTS
Table starts
.1.....1........1............1................1...................1
.1.....4........9...........25...............64.................169
.1.....9.......43..........201..............968................4604
.1....25......201.........2024............21380..............220299
.1....64......968........21380...........468036.............9973284
.1...169.....4604.......220299..........9973284...........455249977
.1...441....22000......2316754........215926776.........21051034046
.1..1156...104976.....24198121.......4649097520........969333059888
.1..3025...501096....253601977.....100274426148......44710643494095
.1..7921..2391737...2654925237....2161781726064....2061425679292684
.1.20736.11415981..27806859021...46610315291176...95053260696179636
.1.54289.54489429.291197368229.1004947894341776.4382893797173364311
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..180
EXAMPLE
Some solutions for n=3 k=4 0=self 2=n 3=ne 4=w 6=e 7=sw 8=s (reciprocal directions total 10)
.00.00.00.00...00.00.00.00...68.48.00.00...00.00.00.78...00.67.47.00
.68.48.68.48...00.68.47.00...26.24.68.48...00.78.36.24...38.38.00.00
.26.24.26.24...00.23.00.00...00.00.26.24...36.24.00.00...26.24.00.00
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin Dec 17 2012
STATUS
approved