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, 1, 0), (-1, 1, 1), (0, 0, -1), (1, 0, 0)}.
A148639
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, 1, 0), (-1, 1, 1), (0, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =22a(5) =62a(6) =215a(7) =692a(8) =2458a(9) =8708a(10) =31475a(11) =114824a(12) =425486a(13) =1599203a(14) =6066110a(15) =23109793a(16) =88859981a(17) =343913830a(18) =1341472353a(19) =5251722971a(20) =20653709763a(21) =81624357922a(22) =324060423282
External references
- oeis: A148639