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A224306 Number of nX4 0..2 arrays with diagonals and rows unimodal and antidiagonals nondecreasing 1
46, 698, 5996, 45453, 345875, 2717759, 22071219, 182843194, 1528645389, 12825738594, 107715455487, 904773390455, 7599493889175, 63827735783412, 536075684379248, 4502373101398007, 37814478865105363, 317596919801312214 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A224310

LINKS

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

FORMULA

Empirical: a(n) = 15*a(n-1) -58*a(n-2) -13*a(n-3) +160*a(n-4) +1879*a(n-5) -7373*a(n-6) +6407*a(n-7) -2233*a(n-8) +11269*a(n-9) -128277*a(n-10) +514460*a(n-11) -559176*a(n-12) +774916*a(n-13) +91024*a(n-14) -426367*a(n-15) -1572540*a(n-16) -2736461*a(n-17) -3322156*a(n-18) -10388293*a(n-19) +187424*a(n-20) -4090338*a(n-21) +4202406*a(n-22) +9112758*a(n-23) +21520552*a(n-24) +26916252*a(n-25) +22991028*a(n-26) +42071688*a(n-27) +28540632*a(n-28) +18156960*a(n-29) +483840*a(n-30) for n>35

EXAMPLE

Some solutions for n=3

..0..0..0..0....0..1..1..1....2..2..0..0....1..1..1..0....0..0..0..2

..0..0..0..1....1..2..2..2....2..2..1..0....1..2..1..1....0..0..2..2

..0..0..2..2....2..2..2..1....2..2..0..0....2..2..1..0....1..2..2..1

CROSSREFS

Sequence in context: A278204 A223929 A224053 * A224370 A078156 A341428

Adjacent sequences:  A224303 A224304 A224305 * A224307 A224308 A224309

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 03 2013

STATUS

approved

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Last modified October 4 09:28 EDT 2022. Contains 357239 sequences. (Running on oeis4.)