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A159222 1/4 the number of nXn arrays of squares of integers with every 2X2 subblock summing to 21 +0
1
7, 20, 45, 95, 193, 389, 777, 1553, 3097, 6185, 12345, 24665, 49273, 98489, 196857, 393593, 786937, 1573625, 3146745, 6292985, 12584953, 25168889, 50335737, 100669433, 201334777, 402665465 (list; graph; listen)
OFFSET

2,1
CROSSREFS

Sequence in context: A162024 A143058 A011934 this_sequence A100206 A007044 A047862

Adjacent sequences: A159219 A159220 A159221 this_sequence A159223 A159224 A159225

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net) Apr 06 2009

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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