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, 0), (-1, 0, 1), (0, 0, 1), (0, 1, -1), (1, 0, -1)}.
A148586
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, 0), (-1, 0, 1), (0, 0, 1), (0, 1, -1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =20a(5) =54a(6) =189a(7) =594a(8) =2143a(9) =7387a(10) =27380a(11) =100067a(12) =379944a(13) =1443052a(14) =5599659a(15) =21844255a(16) =86394133a(17) =343768974a(18) =1381731518a(19) =5584666966a(20) =22751462847a(21) =93150610255a(22) =383799188075
External references
- oeis: A148586