OFFSET
4,2
LINKS
Andrew Howroyd, Table of n, a(n) for n = 4..40
StackExchange, How many arrays with crossed cells, order of rows/columns irrelevant, Dec 13 2013
MAPLE
seq(matrix_marks(n, 4), n=3..15); # Using the uploaded program to A247417
PROG
(PARI) \\ See A304942 for Blocks
a(n) = Blocks(n, n, 4); \\ Andrew Howroyd, May 24 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
Marko Riedel, Sep 21 2014
EXTENSIONS
Terms a(16) and beyond from Andrew Howroyd, May 24 2018
STATUS
approved