id:A156798 - OEIS Search Results

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n^4 + 5*n^2 + 4.

+0
5

4, 10, 40, 130, 340, 754, 1480, 2650, 4420, 6970, 10504, 15250, 21460, 29410, 39400, 51754, 66820, 84970, 106600, 132130, 162004, 196690, 236680, 282490, 334660, 393754, 460360, 535090, 618580, 711490, 814504, 928330, 1053700, 1191370 (list; graph; listen)

	OFFSET	`0,1`
	COMMENT	`a(n) = A002522(n)*A087475(n) = A000290(n)+A000290(A059100(n)) = A028552(A002522(n)).`
	FORMULA	`(n^2 + 1)(n^2 + 4) = n^2 + (n^2 + 2)^2.` `G.f.: 2(2-5x+15x^2-5x^3+5x^4)/(1-x)^5 [From Maksym Voznyy (voznyy(AT)mail.ru), Jul 26 2009]`
	CROSSREFS	`Sequence in context: A149205 A149206 A149207 this_sequence A149208 A149209 A053792` `Adjacent sequences: A156795 A156796 A156797 this_sequence A156799 A156800 A156801`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Feb 16 2009`
	EXTENSIONS	`G.f. proposed by Maksym Voznyy checked and corrected by R. J. Mathar, Sep 16 2009.`

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Last modified December 9 18:50 EST 2009. Contains 170568 sequences.

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