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A204834 Number of (n+1)X3 0..2 arrays with the permanents of all 2X2 subblocks equal and nonzero 1
132, 524, 1616, 6370, 21380, 81706, 284982, 1068556, 3806698, 14134062, 50991492, 188455830, 685297032, 2528016622, 9240734242, 34073187134, 124993402790, 461002644276, 1695445551856, 6256762635894, 23054254621028, 85137162675964 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A204840

LINKS

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

FORMULA

Empirical: a(n) = 7*a(n-1) +27*a(n-2) -272*a(n-3) -166*a(n-4) +4400*a(n-5) -2099*a(n-6) -38451*a(n-7) +40394*a(n-8) +197193*a(n-9) -288743*a(n-10) -602214*a(n-11) +1139080*a(n-12) +1038852*a(n-13) -2693225*a(n-14) -762225*a(n-15) +3842539*a(n-16) -401148*a(n-17) -3143804*a(n-18) +1172882*a(n-19) +1265630*a(n-20) -763476*a(n-21) -143344*a(n-22) +155436*a(n-23) -12496*a(n-24) -5304*a(n-25) +528*a(n-26)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A248555 A253502 A257105 * A241288 A115132 A158543

Adjacent sequences:  A204831 A204832 A204833 * A204835 A204836 A204837

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 19 2012

STATUS

approved

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Last modified September 20 10:10 EDT 2019. Contains 327229 sequences. (Running on oeis4.)