T(n,k)=Number of -k..k arrays x(0..n+1) of n+2 elements with zero sum and nonzero first and second differences.

A200454

T(n,k)=Number of -k..k arrays x(0..n+1) of n+2 elements with zero sum and nonzero first and second differences.

Terms

    a(0) =4a(1) =10a(2) =4a(3) =26a(4) =44a(5) =6a(6) =44a(7) =142a(8) =144a(9) =10a(10) =72a(11) =342a(12) =728a(13) =486a(14) =14a(15) =102a(16) =678a(17) =2334a(18) =3788a(19) =1582a(20) =22a(21) =142a(22) =1148a(23) =5720a(24) =16380a(25) =19802a(26) =5478a(27) =34a(28) =184a(29) =1832

External references