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), (0, 0, -1), (0, 1, -1), (0, 1, 1), (1, 0, 0)}.
A150178
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), (0, 0, -1), (0, 1, -1), (0, 1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =78a(5) =292a(6) =1174a(7) =4713a(8) =19790a(9) =82169a(10) =352532a(11) =1500614a(12) =6541407a(13) =28323936a(14) =124999771a(15) =548162317a(16) =2441238018a(17) =10814093227a(18) =48524457546a(19) =216664906609a(20) =978122156176
External references
- oeis: A150178