OFFSET

3,2

LINKS

Andrew Howroyd, Table of n, a(n) for n = 3..40

StackExchange, How many arrays with crossed cells, order of rows/columns irrelevant, Dec 13 2013

MAPLE

seq(matrix_marks(n, 3), n=3..15); # Using the uploaded program to A247417

PROG

(PARI) \\ See A304942 for Blocks

a(n) = Blocks(n, n, 3); \\ Andrew Howroyd, May 23 2018

CROSSREFS

KEYWORD

nonn

AUTHOR

Marko Riedel, Sep 21 2014

EXTENSIONS

Terms a(17) and beyond from Andrew Howroyd, May 23 2018

STATUS

approved