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, -1, 0), (-1, 1, -1), (-1, 1, 1), (1, 0, 0)}.
A148067
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, -1, 0), (-1, 1, -1), (-1, 1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =12a(5) =25a(6) =87a(7) =189a(8) =788a(9) =1893a(10) =7569a(11) =18601a(12) =80506a(13) =207493a(14) =874156a(15) =2280579a(16) =10100264a(17) =27140517a(18) =117684741a(19) =318421209a(20) =1430927370a(21) =3951930221a(22) =17460909038a(23) =48431305459a(24) =219878196682a(25) =619212387825
External references
- oeis: A148067