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, 0, 1), (-1, 1, -1), (1, -1, 0), (1, 0, 1)}.
A148611
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, 0, 1), (-1, 1, -1), (1, -1, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =21a(5) =53a(6) =202a(7) =573a(8) =2294a(9) =7006a(10) =28850a(11) =92846a(12) =390092a(13) =1303794a(14) =5562947a(15) =19142342a(16) =82613977a(17) =291006973a(18) =1267423687a(19) =4549911567a(20) =19966824583a(21) =72818698095a(22) =321535722525
External references
- oeis: A148611