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, 0), (1, 1, 1)}.
A149113
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, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =9a(4) =30a(5) =90a(6) =308a(7) =963a(8) =3438a(9) =11234a(10) =39658a(11) =135300a(12) =485182a(13) =1661050a(14) =6059294a(15) =21080183a(16) =76433836a(17) =270898590a(18) =989797908a(19) =3508506050a(20) =12938529420a(21) =46251009992a(22) =169911558432a(23) =613777776976
External references
- oeis: A149113