id:A008912 - OEIS Search Results

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Truncated triangular numbers (of form n*(n-3)/2 - k^2+k*n+1 for 1<=k<=n).

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1, 3, 6, 7, 10, 12, 15, 18, 19, 21, 25, 27, 28, 33, 36, 37, 42, 45, 46, 48, 52, 55, 57, 60, 61, 63, 66, 69, 73, 75, 78, 82, 87, 88, 90, 91, 96, 102, 105, 106, 108, 111, 117, 118, 120, 123, 126, 127, 133, 135, 136, 141, 144, 145, 147, 150 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`J. H. Conway and N. J. A. Sloane, Low-Dimensional Lattices VII: Coordination Sequences, Proc. Royal Soc. London, A453 (1997), 2369-2389 (Abstract, pdf, ps).`
	CROSSREFS	`Cf. A008867.` `Adjacent sequences: A008909 A008910 A008911 this_sequence A008913 A008914 A008915` `Sequence in context: A080147 A084463 A096604 this_sequence A101885 A096068 A045412`
	KEYWORD	`nonn`
	AUTHOR	`njas, R. K. Guy`

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Last modified October 12 15:26 EDT 2008. Contains 144830 sequences.

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