id:A030223 - OEIS Search Results

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Triangular polyominoes (n-iamonds) with bilateral symmetry (holes are allowed).

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5

1, 1, 1, 2, 2, 5, 5, 12, 13, 30, 36, 80, 97, 213, 266, 578, 737, 1589, 2051, 4408, 5747, 12333, 16213, 34737, 45979, 98367, 131007, 279902 (list; graph; listen)

	OFFSET	`1,4`
	CROSSREFS	`Cf. A000577, A006534, A030223, A030224.` `Adjacent sequences: A030220 A030221 A030222 this_sequence A030224 A030225 A030226` `Sequence in context: A002014 A135153 A097896 this_sequence A056504 A122205 A094967`
	KEYWORD	`nonn`
	AUTHOR	`David W. Wilson (davidwwilson(AT)comcast.net)`
	EXTENSIONS	`a(19) to a(28) from Joseph Myers (jsm(AT)polyomino.org.uk), Sep 24 2002`

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Last modified November 8 07:45 EST 2009. Contains 166143 sequences.

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