A223797 Number of nX4 0..3 arrays with rows and antidiagonals unimodal.

130, 16900, 1658703, 151310069, 13602542576, 1216562667529, 108631485025292, 9695922803812530, 865293308203272685, 77218182866179219113, 6890814828420641198100, 614921940899081513160269

Offset: 1

Author

R. H. Hardin Mar 27 2013

Keywords

• nonn

Comments

Column 4 of A223801

Examples

			Some solutions for n=3
..0..0..1..1....0..0..2..3....0..0..2..1....0..0..2..1....0..0..0..2
..2..2..2..0....1..2..2..1....2..2..3..3....0..0..2..2....0..0..3..2
..0..1..2..1....0..1..3..1....0..1..2..2....0..3..0..0....3..2..2..1
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210

Formula

Empirical: a(n) = 130*a(n-1) -4151*a(n-2) +55367*a(n-3) -1103289*a(n-4) [phone]*a(n-5) -311713584*a(n-6) [phone]*a(n-7) -14084700670*a(n-8) [phone]*a(n-9) -678666743150*a(n-10) [phone]*a(n-11) -15705615808280*a(n-12) [phone]*a(n-13) -265525650225285*a(n-14) [phone]*a(n-15) -2835818034237058*a(n-16) +7784228337705693*a(n-17) -17375928755819704*a(n-18) +37062908059029592*a(n-19) -69764230981154356*a(n-20) +99762651233668576*a(n-21) -119132184363098064*a(n-22) +127177566453563712*a(n-23) -90807087696380928*a(n-24) +28396177139635200*a(n-25) -1473691515457536*a(n-26) [phone]*a(n-27)