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 A153449 11 times pentagonal numbers: 11n(3n-1)/2. 2
 0, 11, 55, 132, 242, 385, 561, 770, 1012, 1287, 1595, 1936, 2310, 2717, 3157, 3630, 4136, 4675, 5247, 5852, 6490, 7161, 7865, 8602, 9372, 10175, 11011, 11880, 12782, 13717, 14685, 15686, 16720, 17787, 18887, 20020, 21186, 22385 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS FORMULA a(n) = (33n^2 - 11n)/2 = A000326(n)*11. a(n) = 33*n+a(n-1)-22 (with a(0)=0). [From Vincenzo Librandi, Aug 03 2010] G.f.: 11*x*(1+2*x)/(1-x)^3. [Colin Barker, Feb 21 2012] CROSSREFS Cf. A000326. Sequence in context: A079884 A200172 A050900 * A047649 A010927 A009550 Adjacent sequences:  A153446 A153447 A153448 * A153450 A153451 A153452 KEYWORD easy,nonn AUTHOR Omar E. Pol, Dec 26 2008 STATUS approved

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