Number of 2-step self-avoiding walks on an n X n X n cube summed over all starting positions.

Terms

a(0) =0a(1) =24a(2) =108a(3) =288a(4) =600a(5) =1080a(6) =1764a(7) =2688a(8) =3888a(9) =5400a(10) =7260a(11) =9504a(12) =12168a(13) =15288a(14) =18900a(15) =23040a(16) =27744a(17) =33048a(18) =38988a(19) =45600a(20) =52920a(21) =60984a(22) =69828a(23) =79488a(24) =90000a(25) =101400a(26) =113724a(27) =127008a(28) =141288a(29) =156600