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)}.
A148417
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) =5a(4) =18a(5) =53a(6) =195a(7) =679a(8) =2644a(9) =9717a(10) =39573a(11) =152777a(12) =634106a(13) =2534293a(14) =10725654a(15) =43864275a(16) =188331104a(17) =785364407a(18) =3407302997a(19) =14424526791a(20) =63162786264a(21) =270620636929
External references
- oeis: A148417