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), (0, 1, -1), (1, 0, 0)}.
A148016
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), (0, 1, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =8a(5) =17a(6) =46a(7) =117a(8) =337a(9) =954a(10) =2765a(11) =8334a(12) =25350a(13) =78302a(14) =244664a(15) =777806a(16) =2495210a(17) =8049224a(18) =26288829a(19) =86510067a(20) =286120463a(21) =952818316a(22) =3193840880a(23) =10759053541a(24) =36391963273a(25) =123723824745a(26) =422498010677
External references
- oeis: A148016