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, 1), (1, -1, 1), (1, 0, 1), (1, 1, -1)}.
A148849
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, 1), (1, -1, 1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =28a(5) =91a(6) =330a(7) =1158a(8) =4301a(9) =15704a(10) =59202a(11) =221160a(12) =842264a(13) =3192043a(14) =12246092a(15) =46861680a(16) =180776672a(17) =696518376a(18) =2698468580a(19) =10449533172a(20) =40622230498a(21) =157911491626a(22) =615583136488
External references
- oeis: A148849