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A204835 Number of (n+1)X4 0..2 arrays with the permanents of all 2X2 subblocks equal and nonzero 1
318, 1616, 7070, 34100, 157872, 752028, 3530808, 16789864, 79293448, 377319812, 1788274836, 8518844116, 40475837046, 193014313760, 918808191844, 4385300981366, 20905548073454, 99850385810890, 476532537931898 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A204840

LINKS

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

FORMULA

Empirical: a(n) = 8*a(n-1) +46*a(n-2) -463*a(n-3) -827*a(n-4) +11584*a(n-5) +7209*a(n-6) -167177*a(n-7) -24235*a(n-8) +1555772*a(n-9) -108939*a(n-10) -9844492*a(n-11) +1639028*a(n-12) +43404736*a(n-13) -9040868*a(n-14) -134200436*a(n-15) +30728164*a(n-16) +288648563*a(n-17) -71549296*a(n-18) -422266864*a(n-19) +116364363*a(n-20) +403049929*a(n-21) -126818335*a(n-22) -233198888*a(n-23) +83721106*a(n-24) +71218296*a(n-25) -28108413*a(n-26) -8643432*a(n-27) +3559710*a(n-28) +142560*a(n-29) -78408*a(n-30)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A045272 A278131 A075153 * A281078 A262846 A225579

Adjacent sequences:  A204832 A204833 A204834 * A204836 A204837 A204838

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 19 2012

STATUS

approved

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Last modified October 20 20:24 EDT 2019. Contains 328273 sequences. (Running on oeis4.)