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, 0), (0, 1, 0), (0, 1, 1), (1, -1, -1)}.
A149901
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, 0), (0, 1, 0), (0, 1, 1), (1, -1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =14a(4) =47a(5) =159a(6) =574a(7) =2109a(8) =8169a(9) =31723a(10) =126215a(11) =509507a(12) =2092740a(13) =8635109a(14) =36085069a(15) =152237219a(16) =646761004a(17) =2761600479a(18) =11884514477a(19) =51431756012a(20) =223469531806a(21) =975384346075
External references
- oeis: A149901