Number of -1..1 arrays x(0..n+2) of n+3 elements with zero sum and nonzero second and third differences.

A200197

Number of -1..1 arrays x(0..n+2) of n+3 elements with zero sum and nonzero second and third differences.

Terms

    a(0) =12a(1) =22a(2) =50a(3) =90a(4) =192a(5) =360a(6) =752a(7) =1472a(8) =3060a(9) =6104a(10) =12596a(11) =25368a(12) =52230a(13) =106038a(14) =218204a(15) =445350a(16) =916598a(17) =1877598a(18) =3866920a(19) =7942794a(20) =16372182a(21) =33699352a(22) =69526894a(23) =143344944a(24) =296012610a(25) =611113112a(26) =1263073756a(27) =2610512928a(28) =5399923198

External references