The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A024389 [ (4th elementary symmetric function of S(n))/(2nd elementary symmetric function of S(n)) ], where S(n) = {first n+3 positive integers congruent to 1 mod 4}. 0
 2, 19, 72, 190, 409, 773, 1336, 2159, 3309, 4863, 6907, 9532, 12840, 16939, 21945, 27985, 35189, 43699, 53664, 65239, 78591, 93891, 111320, 131067, 153328, 178309, 206221, 237286, 271732, 309795, 351722, 397763, 448180, 503242, 563224, 628413 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS FORMULA Empirical g.f.: -x*(x^17 -2*x^16 +2*x^14 -x^13 -x^11 +2*x^10 -4*x^8 +4*x^7 +12*x^6 +21*x^5 +23*x^4 +27*x^3 +21*x^2 +13*x +2) / ((x -1)^5*(x^2 +x +1)*(x^4 +x^3 +x^2 +x +1)). - Colin Barker, Aug 16 2014 a(n) = floor(A024380(n) / A024378(n+2)). - Sean A. Irvine, Jul 06 2019 CROSSREFS Sequence in context: A079773 A217082 A024220 * A110050 A219121 A054209 Adjacent sequences:  A024386 A024387 A024388 * A024390 A024391 A024392 KEYWORD nonn AUTHOR STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified January 23 13:38 EST 2020. Contains 331171 sequences. (Running on oeis4.)