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, 0), (1, 0, 1)}.
A150060
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, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =18a(4) =63a(5) =223a(6) =834a(7) =3148a(8) =12321a(9) =48842a(10) =197195a(11) =802913a(12) =3312911a(13) =13793969a(14) =57941047a(15) =244897539a(16) =1042046861a(17) =4460577115a(18) =19196956607a(19) =82985003819a(20) =360239578255
External references
- oeis: A150060