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), (0, 0, -1), (1, 0, 1)}.
A148672
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), (0, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =21a(5) =62a(6) =201a(7) =633a(8) =2039a(9) =6740a(10) =22605a(11) =76638a(12) =260854a(13) =899130a(14) =3106961a(15) =10801535a(16) =37807635a(17) =132935072a(18) =469231691a(19) =1660888854a(20) =5907569428a(21) =21056698312a(22) =75251862261a(23) =269722099238a(24) =969177576954
External references
- oeis: A148672