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A153449
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11 times pentagonal numbers: 11n(3n-1)/2.
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2
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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; internal format)
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OFFSET
| 0,2
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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 (vincenzo.librandi(AT)tin.it), Aug 03 2010]
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EXAMPLE
| a(1)=33*1+0-22=11; a(2)=33*2+11-22=55; a(3)=33*3+55-22=132 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 03 2010]
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CROSSREFS
| Cf. A000326.
Sequence in context: A079884 A200172 A050900 * A047649 A010927 A009550
Adjacent sequences: A153446 A153447 A153448 * A153450 A153451 A153452
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KEYWORD
| easy,nonn
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), Dec 26 2008
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