A015221 - OEIS

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A015221

Odd square pyramidal numbers.

1, 5, 55, 91, 285, 385, 819, 1015, 1785, 2109, 3311, 3795, 5525, 6201, 8555, 9455, 12529, 13685, 17575, 19019, 23821, 25585, 31395, 33511, 40425, 42925, 51039, 53955, 63365, 66729, 77531, 81375, 93665, 98021, 111895, 116795, 132349, 137825 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	FORMULA	`Odd numbers of the form n(n+1)(2n+1)/6.`
	CROSSREFS	`Sequence in context: A132619 A085719 A129420 * A035305 A057722 A078216` `Adjacent sequences: A015218 A015219 A015220 * A015222 A015223 A015224`
	KEYWORD	`nonn,easy`
	AUTHOR	`Mohammad K. Azarian (ma3(AT)evansville.edu)`
	EXTENSIONS	`More terms from Erich Friedman (erich.friedman(AT)stetson.edu).`

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Last modified February 14 18:33 EST 2012. Contains 205663 sequences.