Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 0, 1), (-1, 1, -1), (0, 0, 1), (1, 0, -1)}.
A148177
Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 0, 1), (-1, 1, -1), (0, 0, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =12a(5) =28a(6) =86a(7) =238a(8) =784a(9) =2325a(10) =8058a(11) =25360a(12) =90373a(13) =297465a(14) =1086446a(15) =3692655a(16) =13756875a(17) =48012753a(18) =181628315a(19) =647909195a(20) =2482768099a(21) =9016569288a(22) =34932498872a(23) =128802722018a(24) =503682591606
External references
- oeis: A148177