Number of zero-sum -n..n arrays of 7 elements with first through third differences also in -n..n.

A202515

Number of zero-sum -n..n arrays of 7 elements with first through third differences also in -n..n.

Terms

    a(0) =7a(1) =109a(2) =747a(3) =3285a(4) =10799a(5) =29295a(6) =68781a(7) =145389a(8) =282771a(9) =514931a(10) =887733a(11) =1463059a(12) =2320007a(13) =3560523a(14) =5310021a(15) =7724815a(16) =10991973a(17) =15338839a(18) =21031377a(19) =28387187a(20) =37770899a(21) =49610615a(22) =64391723a(23) =82677087a(24) =105095693a(25) =132370313a(26) =165301879

External references