Number of walks on cubic lattice.

Terms

a(0) =76a(1) =288a(2) =700a(3) =1376a(4) =2380a(5) =3776a(6) =5628a(7) =8000a(8) =10956a(9) =14560a(10) =18876a(11) =23968a(12) =29900a(13) =36736a(14) =44540a(15) =53376a(16) =63308a(17) =74400a(18) =86716a(19) =100320a(20) =115276a(21) =131648a(22) =149500a(23) =168896a(24) =189900a(25) =212576a(26) =236988a(27) =263200a(28) =291276a(29) =321280