login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A151518 Number of 2-sided strip polyiamonds with n cells. 0
1, 1, 1, 2, 3, 5, 8, 15, 25, 46, 80, 145, 256, 466, 833, 1513, 2720, 4925, 8881, 16063, 28996, 52373, 94563, 170620, 307989, 555214, 1001774, 1804594, 3254229, 5858448 (list; graph; refs; listen; history; internal format)
OFFSET

1,4

LINKS

Ed Pegg, Jr., Illustrations of polyforms

Eric Weisstein's World of Mathematics, Polyiamond

CROSSREFS

Sequence in context: A058519 A181065 A191792 * A082095 A177486 A006982

Adjacent sequences:  A151515 A151516 A151517 * A151519 A151520 A151521

KEYWORD

nonn

AUTHOR

Ed Pegg, Jr., (ed(AT)mathpuzzle.com), May 13 2009

EXTENSIONS

a(21)-a(30) from Joseph Myers (jsm(AT)polyomino.org.uk), Nov 27 2010

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 17 08:44 EST 2012. Contains 205998 sequences.