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), (0, 1, 1), (1, -1, 1), (1, 0, -1)}.
A149040
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), (0, 1, 1), (1, -1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =10a(4) =36a(5) =130a(6) =520a(7) =2067a(8) =8494a(9) =35300a(10) =149423a(11) =635968a(12) =2745231a(13) =11899039a(14) =52046711a(15) =228659377a(16) =1010809064a(17) =4485019664a(18) =19996926503a(19) =89433261856a(20) =401494048103
External references
- oeis: A149040