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2, 1, 2, 5, 10, 17, 26, 37, 50, 65, 82, 101, 122, 145, 170, 197, 226, 257, 290, 325, 362, 401, 442, 485, 530, 577, 626, 677, 730, 785, 842, 901, 962, 1025, 1090, 1157, 1226, 1297, 1370, 1445, 1522, 1601, 1682, 1765, 1850, 1937, 2026, 2117, 2210, 2305, 2402, 2501, 2602, 2705, 2810
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| Competition number of the complete bipartite graph K_n,n.
Formula given on p. 3 of Sano.
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LINKS
| Yoshio Sano, The competition numbers of regular polyhedra, May 12, 2009.
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FORMULA
| a(n)=a(n-1)+2*n-3 (with a(0)=2) [From Vincenzo Librandi, Dec 03 2010]
a(n)= +3*a(n-1) -3*a(n-2) +a(n-3). G.f.: -(2-5*x+5*x^2)/(x-1)^3.
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MATHEMATICA
| Table[n^2-2*n+2, {n, 0, 5!}] (*From Vladimir Joseph Stephan Orlovsky (4vladimir(AT)gmail.com), 29 Dec 2010*)
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PROG
| (PARI) vector(100, n, n^2 - 2*n + 2)
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CROSSREFS
| Cf. A160450.
Sequence in context: A201163 A049901 A117715 * A107087 A115141 A031148
Adjacent sequences: A160454 A160455 A160456 * A160458 A160459 A160460
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KEYWORD
| easy,nonn
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AUTHOR
| Jonathan Vos Post (jvospost3(AT)gmail.com), May 14 2009
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EXTENSIONS
| More terms from Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 08 2009
Sequence corrected by Joerg Arndt, Dec 03 2010.
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