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, 1), (-1, 1, 1), (0, 0, -1), (1, 0, 1)}.
A148709
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, 1), (-1, 1, 1), (0, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =23a(5) =75a(6) =263a(7) =887a(8) =3083a(9) =11113a(10) =41047a(11) =152527a(12) =569457a(13) =2148383a(14) =8187627a(15) =31443371a(16) =121513901a(17) =471911807a(18) =1842127673a(19) =7228170727a(20) =28497458131a(21) =112756970083a(22) =447551971193
External references
- oeis: A148709