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A115065 Number of points with integer coordinates inside the equilateral triangle with base [0,n]. +0
1
2, 4, 6, 10, 14, 20, 26, 33, 40, 49, 58, 69, 80, 93, 106, 120, 134, 150, 166, 184, 202, 222, 242, 263, 284, 307, 330, 355, 380, 406, 432, 460, 488, 518, 548, 580, 612, 645, 678, 713, 748, 785, 822, 861, 900, 940, 980, 1022 (list; graph; listen)
OFFSET

1,1
CROSSREFS

Sequence in context: A082379 A094589 A071425 this_sequence A008804 A001307 A088932

Adjacent sequences: A115062 A115063 A115064 this_sequence A115066 A115067 A115068

KEYWORD

nonn

AUTHOR

Neven Juric (neven.juric(AT)apis-it.hr), Jun 20 2006

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Last modified November 18 20:14 EST 2008. Contains 147244 sequences.

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