OFFSET
1,5
COMMENTS
Table starts
.1....1........1...........1..............1................1.................1
.1....2........7..........21.............68..............221...............717
.1....4.......30.........230...........1819............14466............114900
.1....8......126........2586..........52189..........1071230..........21914482
.1...16......534.......29310........1485872.........78144195........4067687187
.1...32.....2275......331589.......42378036.......5717794568......759141297226
.1...64.....9667.....3751888.....1208447287.....418227762771...141539684300104
.1..128....41089....42452438....34459871148...30590627951201.26392338517041335
.1..256...174660...480346122...982649830527.2237516237251959
.1..512...742428..5435081884.28021037742705
.1.1024..3155820.61497557384
.1.2048.13414405
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..111
EXAMPLE
Some solutions for n=3 k=4 0=self 1=nw 3=ne 4=w 6=e 7=sw 9=se (reciprocal directions total 10)
.00.67.49.00...00.00.67.47...00.00.67.47...00.79.67.47...00.67.49.00
.39.00.79.17...69.34.37.00...00.39.37.00...39.39.13.00...36.47.00.17
.00.13.36.14...00.13.00.00...00.36.14.00...00.16.14.00...36.46.34.00
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin Dec 18 2012
STATUS
approved