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, -1, 1), (-1, 1, 0), (1, 0, -1), (1, 0, 1)}.
A148734
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, -1, 1), (-1, 1, 0), (1, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =25a(5) =79a(6) =289a(7) =939a(8) =3879a(9) =13721a(10) =56351a(11) =204359a(12) =876107a(13) =3363515a(14) =14276417a(15) =54939611a(16) =242275331a(17) =961373425a(18) =4204643455a(19) =16739963681a(20) =74880644565a(21) =306101300517
External references
- oeis: A148734