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, 0, 0), (-1, 1, 1), (0, -1, 1), (0, 1, -1), (1, 0, 0)}.
A148712
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, 0, 0), (-1, 1, 1), (0, -1, 1), (0, 1, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =23a(5) =77a(6) =279a(7) =1071a(8) =4175a(9) =16915a(10) =69121a(11) =288603a(12) =1216117a(13) =5189235a(14) =22335903a(15) =96940641a(16) =423827479a(17) =1864412329a(18) =8249932349a(19) =36684093067a(20) =163886594135a(21) =735100587513
External references
- oeis: A148712