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, 0, 1), (0, -1, 0), (0, 1, 1), (1, 0, -1)}.
A148947
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, 0, 1), (0, -1, 0), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =30a(5) =100a(6) =374a(7) =1388a(8) =5432a(9) =21140a(10) =85814a(11) =346706a(12) =1441436a(13) =5968072a(14) =25281324a(15) =106700835a(16) =458490321a(17) =1963661842a(18) =8535636877a(19) =36992407718a(20) =162318727824a(21) =710304997081
External references
- oeis: A148947