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, 0, 1), (-1, 1, 0), (0, -1, 1), (1, 0, -1), (1, 0, 1)}.
A149380
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, 0, 1), (-1, 1, 0), (0, -1, 1), (1, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =48a(5) =175a(6) =720a(7) =2926a(8) =12453a(9) =53326a(10) =233271a(11) =1029702a(12) =4600541a(13) =20713662a(14) =94035765a(15) =429502102a(16) =1973663417a(17) =9113809036a(18) =42279636026a(19) =196921587757a(20) =920531411848
External references
- oeis: A149380