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A241398 Number of 2Xn 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of the elements above it or zero plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4 1
3, 5, 9, 23, 44, 93, 204, 368, 761, 1583, 2951, 6056, 12244, 23588, 47945, 95715, 187731, 378531, 752679, 1489014, 2986657, 5934705, 11787915, 23567455, 46847503, 93218990, 186017656, 369978815, 736728537, 1468604461, 2922396725, 5820645191 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 2 of A241397

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-2) +8*a(n-3) -a(n-4) -10*a(n-5) -18*a(n-6) +8*a(n-7) +20*a(n-8) +20*a(n-9) -24*a(n-10) -22*a(n-11) -a(n-12) +32*a(n-13) +8*a(n-14) -3*a(n-15) -12*a(n-16) +4*a(n-17) -5*a(n-18) -4*a(n-20) -3*a(n-21) +2*a(n-22) for n>23

EXAMPLE

Some solutions for n=4

..3..2..2..2....2..3..2..2....3..2..3..2....2..3..3..2....3..2..3..3

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

CROSSREFS

Sequence in context: A147038 A146275 A089636 * A262483 A083366 A006722

Adjacent sequences:  A241395 A241396 A241397 * A241399 A241400 A241401

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 20 2014

STATUS

approved

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Last modified October 23 16:53 EDT 2018. Contains 316529 sequences. (Running on oeis4.)