A224353 - OEIS

%I #4 Apr 04 2013 10:31:21

%S 3,6,9,10,36,27,15,100,216,81,21,225,788,1296,243,28,441,2321,5880,

%T 7776,729,36,784,5840,19608,45064,46656,2187,45,1296,13052,57387,

%U 160362,349280,279936,6561,55,2025,26610,151010,495985,1351748,2710892,1679616

%N T(n,k)=Number of nXk 0..2 arrays with diagonals and antidiagonals unimodal and rows nondecreasing

%C Table starts

%C .....3........6.........10.........15..........21..........28...........36

%C .....9.......36........100........225.........441.........784.........1296

%C ....27......216........788.......2321........5840.......13052........26610

%C ....81.....1296.......5880......19608.......57387......151010.......363392

%C ...243.....7776......45064.....160362......495985.....1421762......3816783

%C ...729....46656.....349280....1351748.....4231138....12340932.....34697869

%C ..2187...279936....2710892...11704964....37433596...107694133....300892325

%C ..6561..1679616...21021916..102319662...342170839...977742699...2654062881

%C .19683.10077696..163012744..895494806..3178789749..9202126546..24422915139

%C .59049.60466176.1264202660.7833508842.29672959682.88363107023.233364588801

%H R. H. Hardin, <a href="/A224353/b224353.txt">Table of n, a(n) for n = 1..264</a>

%F Empirical: columns k=1..6 have recurrences of order 1,1,10,26,56,98

%F Empirical: rows n=1..7 are polynomials of degree 2*n for k>0,0,1,3,5,7,9

%e Some solutions for n=3 k=4

%e ..1..1..1..2....0..0..1..1....0..0..2..2....1..2..2..2....0..2..2..2

%e ..1..1..1..2....0..0..2..2....0..1..1..2....0..1..2..2....1..1..2..2

%e ..0..0..1..2....0..1..1..1....0..1..1..2....1..2..2..2....1..1..1..2

%Y Column 1 is A000244

%Y Column 2 is A000400

%Y Row 1 is A000217(n+1)

%Y Row 2 is A000537(n+1)

%K nonn,tabl

%O 1,1

%A _R. H. Hardin_ Apr 04 2013