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, 0, 1), (1, -1, -1), (1, 1, -1)}.
A148404
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, 0, 1), (1, -1, -1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =17a(5) =50a(6) =183a(7) =612a(8) =2427a(9) =8825a(10) =36059a(11) =138389a(12) =581717a(13) =2316687a(14) =9922307a(15) =40628935a(16) =176649853a(17) =738938555a(18) =3250269764a(19) =13829300753a(20) =61402897922a(21) =264875758505
External references
- oeis: A148404