Number of -n..n arrays x(0..3) of 4 elements with zero sum and no two or three adjacent elements summing to zero.

A200431

Number of -n..n arrays x(0..3) of 4 elements with zero sum and no two or three adjacent elements summing to zero.

Terms

    a(0) =0a(1) =20a(2) =92a(3) =248a(4) =520a(5) =940a(6) =1540a(7) =2352a(8) =3408a(9) =4740a(10) =6380a(11) =8360a(12) =10712a(13) =13468a(14) =16660a(15) =20320a(16) =24480a(17) =29172a(18) =34428a(19) =40280a(20) =46760a(21) =53900a(22) =61732a(23) =70288a(24) =79600a(25) =89700a(26) =100620a(27) =112392a(28) =125048a(29) =138620

External references