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, -1), (1, -1, 0), (1, 1, 0)}.
A148522
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, -1), (1, -1, 0), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =5a(4) =17a(5) =40a(6) =139a(7) =365a(8) =1321a(9) =3796a(10) =13865a(11) =41676a(12) =155184a(13) =487528a(14) =1823899a(15) =5870889a(16) =22212061a(17) =73415388a(18) =278531017a(19) =934712928a(20) =3572512184a(21) =12202646184a(22) =46722602013a(23) =161264038912a(24) =620704085796
External references
- oeis: A148522