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, 1), (-1, 0, 1), (0, -1, 1), (0, 0, 1), (1, 1, -1)}.
A148474
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, 1), (-1, 0, 1), (0, -1, 1), (0, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =20a(5) =65a(6) =241a(7) =889a(8) =3472a(9) =13622a(10) =55340a(11) =225557a(12) =940725a(13) =3937330a(14) =16738031a(15) =71404967a(16) =307999065a(17) =1332931401a(18) =5815439839a(19) =25450058722a(20) =112060278048a(21) =494798567807
External references
- oeis: A148474