id:A152113 - OEIS Search Results

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A001333 with terms repeated.

+0
4

1, 1, 3, 3, 7, 7, 17, 17, 41, 41, 99, 99, 239, 239, 577, 577, 1393, 1393, 3363, 3363, 8119, 8119, 19601, 19601, 47321, 47321, 114243, 114243, 275807, 275807, 665857, 665857, 1607521, 1607521, 3880899, 3880899, 9369319, 9369319, 22619537, 22619537, 54608393 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`Suggested by an email message from Hugo van der Sanden, Mar 23 2009, who says: Consider the partitions of a 2 x n rectangle into connected pieces consisting of unit squares cut along lattice lines. Then a(n) is the number of distinct pieces with rotational symmetry that extend to opposite corners.`
	EXAMPLE	`Example: the pieces iullustrating a(3) = 3 are:` `AAA BB. .CC` `AAA .BB CC.`
	CROSSREFS	`Cf. A001333, A078469, A152124.` `Sequence in context: A147190 A146450 A147144 this_sequence A146149 A070925 A146687` `Adjacent sequences: A152110 A152111 A152112 this_sequence A152114 A152115 A152116`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Sep 21 2009`

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

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