login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A236030
Number of (n+1) X (3+1) 0..2 arrays colored with the difference of the upper median and the lower median in each 2 X 2 subblock.
1
1848, 14980, 116786, 965344, 8289258, 68613596, 570818506, 4747089488, 39848021722, 330427763000, 2767283162570, 22979305037276, 192512468335056, 1597892870968064, 13385558626977130, 111129970428464292
OFFSET
1,1
COMMENTS
Column 3 of A236035.
FORMULA
Empirical recurrence of order 92 (see link above).
EXAMPLE
Some solutions for n=3
..0..1..2..2....1..0..1..0....0..0..1..0....0..0..1..0....2..1..2..0
..0..0..2..1....0..1..2..2....1..0..2..1....0..2..2..1....0..0..1..2
..1..2..2..1....2..1..2..1....0..2..0..2....0..2..0..2....0..0..1..0
..0..1..0..1....2..1..1..2....2..2..1..1....1..1..0..0....2..2..1..0
CROSSREFS
Cf. A236035.
Sequence in context: A092003 A090783 A247724 * A237892 A326318 A115719
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 18 2014
STATUS
approved