id:A053595 - OEIS Search Results

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Open 3-dimensional ball numbers (version 3): a(n)= number of integer points (i,j,k) contained in a open ball of diameter n, centered at (1/2,1/2,0).

+0
1

0, 0, 4, 12, 36, 56, 112, 168, 268, 372, 536, 680, 888, 1132, 1452, 1740, 2160, 2544, 3048, 3556, 4196, 4812, 5552, 6304, 7248, 8116, 9220, 10280, 11512, 12656, 14108, 15564, 17164, 18800, 20664, 22368, 24436, 26412, 28692, 30984, 33536 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`a(n)/(n/2)^3->4/3*Pi`
	CROSSREFS	`Sequence in context: A079736 A035045 A090328 this_sequence A062858 A095735 A020875` `Adjacent sequences: A053592 A053593 A053594 this_sequence A053596 A053597 A053598`
	KEYWORD	`easy,nonn`
	AUTHOR	`Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Jan 19 2000`

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Last modified September 6 16:04 EDT 2008. Contains 143483 sequences.

AT&T Labs Research