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A146506
Number of n X n arrays of squares of integers summing to 18 with every element equal to at least one neighbor.
1
4, 90, 12424, 2808172, 449235282, 107282960684, 5345302912844, 102834566977650
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OFFSET
2,1
LINKS
Table of n, a(n) for n=2..9.
CROSSREFS
Sequence in context:
A274056
A339987
A202918
*
A202575
A201721
A374158
Adjacent sequences:
A146503
A146504
A146505
*
A146507
A146508
A146509
KEYWORD
nonn
AUTHOR
R. H. Hardin
Apr 14 2009
STATUS
approved
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Last modified August 30 07:09 EDT 2024. Contains 375532 sequences. (Running on oeis4.)