A145244 1/5 of the number of 5-colorings of an n X n array symmetric about both diagonal and antidiagonal.

1, 4, 64, 832, 43264, 1827904, 308948224, 42427198528, 23308417310464, 10404188730539968, 18578639958381807616, 26955458921407543923136, 156455150623383016555451392

Offset

1,2

Links

Table of n, a(n) for n=1..13.

Crossrefs

Sequence in context: A264567 A264575 A053957 * A268165 A026301 A010042

Adjacent sequences: A145241 A145242 A145243 * A145245 A145246 A145247

Keyword

nonn

Author

R. H. Hardin, Oct 05 2008

Status

approved