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A033572
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(2*n+1)*(7*n+1).
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4
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1, 24, 75, 154, 261, 396, 559, 750, 969, 1216, 1491, 1794, 2125, 2484, 2871, 3286, 3729, 4200, 4699, 5226, 5781, 6364, 6975, 7614, 8281, 8976, 9699, 10450, 11229, 12036, 12871, 13734, 14625, 15544, 16491
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Sequence found by reading the line from 1, in the direction 1, 24,..., in the square spiral whose vertices are the generalized enneagonal numbers A118277. Also sequence found by reading the same line in the square spiral whose edges have length A195019 and whose vertices are the numbers A195020. - Omar E. Pol, Sep 13 2011
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FORMULA
| A033572 a(n)=a(n-1)+28*n-5 (with a(0)=1) [From Vincenzo Librandi, Nov 17 2010]
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CROSSREFS
| Bisection of A001106. - Omar E. Pol, Sep 09 2011
Sequence in context: A042134 A045249 A185940 * A195027 A048352 A144459
Adjacent sequences: A033569 A033570 A033571 * A033573 A033574 A033575
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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