A159222 - OEIS

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A159222

1/4 the number of nXn arrays of squares of integers with every 2X2 subblock summing to 21

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; refs; listen; history; internal format)

	OFFSET	`2,1`
	CROSSREFS	`Sequence in context: A143058 A175428 A011934 * A100206 A007044 A047862` `Adjacent sequences: A159219 A159220 A159221 * A159223 A159224 A159225`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin (rhhardin(AT)att.net) Apr 06 2009`

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Last modified February 15 02:50 EST 2012. Contains 205694 sequences.