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Search: id:A108211
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| 17, 65, 145, 257, 401, 577, 785, 1025, 1297, 1601, 1937, 2305, 2705, 3137, 3601, 4097, 4625, 5185, 5777, 6401, 7057, 7745, 8465, 9217, 10001, 10817, 11665, 12545, 13457, 14401, 15377, 16385, 17425, 18497, 19601, 20737, 21905, 23105, 24337, 25601
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Area of a Maltese cross conventionally inscribed in a 5n X 5n-grid.
a(n) = A002522(4*n) = A016802(n) + 1.
Areas of some other crosses, each made from unit squares, as shown in Weisstein's illustrations: Greek Cross = x-pentomino = 5. Latin Cross = 6. Saint Andrew's cross = crux decussata = 9. Saint Anthony's Cross = tau cross = crux commissa = 10. Gaullist Cross = cross of lorraine or patriarchal cross = 13. Papal Cross = 22. - Jonathan Vos Post (jvospost2(AT)yahoo.com), Jun 18 2005
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LINKS
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Eric Weisstein's World of Mathematics, Maltese Cross
Eric Weisstein's World of Mathematics, Gaullist Cross.
Eric Weisstein's World of Mathematics, Greek Cross.
Eric Weisstein's World of Mathematics, Latin Cross.
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CROSSREFS
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Sequence in context: A125992 A054402 A086533 this_sequence A130885 A036545 A044155
Adjacent sequences: A108208 A108209 A108210 this_sequence A108212 A108213 A108214
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KEYWORD
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nonn
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AUTHOR
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Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Jun 15 2005
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