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, 1), (1, 0, -1), (1, 0, 0)}.
A148273
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, 1), (1, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =15a(5) =40a(6) =143a(7) =416a(8) =1713a(9) =5656a(10) =22700a(11) =76363a(12) =329653a(13) =1187031a(14) =5016800a(15) =18190009a(16) =80531373a(17) =305215724a(18) =1328055225a(19) =5041718093a(20) =22685251909a(21) =88921805740a(22) =394197025928
External references
- oeis: A148273