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), (0, 0, 1), (0, 1, -1), (1, 0, -1)}.
A148500
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), (0, 0, 1), (0, 1, -1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =5a(4) =15a(5) =33a(6) =109a(7) =279a(8) =949a(9) =2605a(10) =9109a(11) =26629a(12) =94979a(13) =288391a(14) =1041801a(15) =3269639a(16) =11955911a(17) =38443705a(18) =141695339a(19) =465029111a(20) =1727437497a(21) =5764533389a(22) =21534026857a(23) =72876464863a(24) =273704178283a(25) =937530491617
External references
- oeis: A148500