id:A028992 - OEIS Search Results

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Even 9-gonal (or enneagonal) numbers.

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24, 46, 154, 204, 396, 474, 750, 856, 1216, 1350, 1794, 1956, 2484, 2674, 3286, 3504, 4200, 4446, 5226, 5500, 6364, 6666, 7614, 7944, 8976, 9334, 10450, 10836, 12036, 12450, 13734, 14176, 15544, 16014, 17466, 17964, 19500, 20026, 21646 (list; graph; listen)

	OFFSET	`1,1`
	LINKS	`Eric Weisstein's World of Mathematics, Source`
	FORMULA	`(1/2)[28n^2 + 60n + 33 + (14n+15)(-1)^n].`
	CROSSREFS	`Cf. A001106.` `Sequence in context: A000496 A063323 A154590 this_sequence A040552 A098427 A105651` `Adjacent sequences: A028989 A028990 A028991 this_sequence A028993 A028994 A028995`
	KEYWORD	`nonn`
	AUTHOR	`Patrick De Geest (pdg(AT)worldofnumbers.com)`

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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.

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