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 A156798 a(n) = n^4 + 5*n^2 + 4. 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; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Shawn A. Broyles, Table of n, a(n) for n = 0..1000 FORMULA a(n) = A002522(n)*A087475(n) = A000290(n)+A000290(A059100(n)) = A028552(A002522(n)). (n^2 + 1)*(n^2 + 4) = n^2 + (n^2 + 2)^2. G.f.: 2*(2-5*x+15*x^2-5*x^3+5*x^4)/(1-x)^5. - Maksym Voznyy (voznyy(AT)mail.ru), Jul 26 2009 a(0)=4, a(1)=10, a(2)=40, a(3)=130, a(4)=340, a(n)=5a(n-1)- 10a(n-2)+ 10a(n-3)-5a(n-4)+a(n-5). - Harvey P. Dale, May 04 2011 MATHEMATICA Table[n^4+5n^2+4, {n, 0, 40}] PROG (MAGMA)[n^4+5*n^2+4: n in [0..50]] (PARI) a(n)=n^4+5*n^2+4 CROSSREFS Sequence in context: A149205 A149206 A149207 * A149208 A149209 A053792 Adjacent sequences:  A156795 A156796 A156797 * A156799 A156800 A156801 KEYWORD nonn,easy AUTHOR Reinhard Zumkeller, Feb 16 2009 EXTENSIONS G.f. proposed by Maksym Voznyy checked and corrected by R. J. Mathar, Sep 16 2009. STATUS approved

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Last modified February 16 15:17 EST 2020. Contains 331961 sequences. (Running on oeis4.)