16*P_6(n), 16 times the Legendre Polynomial of order 6 at n.

Terms

a(0) =-5a(1) =16a(2) =10159a(3) =143824a(4) =867211a(5) =3415120a(6) =10373071a(7) =26425744a(8) =59271739a(9) =120704656a(10) =227860495a(11) =404631376a(12) =683245579a(13) =1106013904a(14) =1727242351a(15) =2615311120a(16) =3854919931a(17) =5549499664a(18) =7823790319a(19) =10826585296a(20) =14733641995a(21) =19750758736a(22) =26117017999