id:A154958 - OEIS Search Results

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Diagonal sums of number triangle A154957.

+0
2

1, 1, 2, 1, 2, 1, 3, 2, 4, 2, 4, 2, 5, 3, 6, 3, 6, 3, 7, 4, 8, 4, 8, 4, 9, 5, 10, 5, 10, 5, 11, 6, 12, 6, 12, 6, 13, 7, 14, 7, 14, 7, 15, 8, 16, 8, 16, 8, 17, 9, 18, 9, 18, 9, 19, 10, 20, 10, 20, 10, 21, 11, 22, 11, 22, 11, 23, 12, 24, 12, 24, 12, 25, 13, 26, 13, 26, 13, 27, 14, 28, 14, 28 (list; graph; listen)

	OFFSET	`0,3`
	FORMULA	`a(2n)=A004523(n+2); a(2n+1)=floor((n+3)/3)=A002264(n+3).`
	CROSSREFS	`Sequence in context: A035458 A054065 A139024 this_sequence A025806 A025802 A139631` `Adjacent sequences: A154955 A154956 A154957 this_sequence A154959 A154960 A154961`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Jan 18 2009`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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