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, 1, 0), (-1, 1, 1), (1, 0, -1), (1, 0, 0)}.
A148660
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, 1, 0), (-1, 1, 1), (1, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =25a(5) =66a(6) =277a(7) =817a(8) =3651a(9) =11758a(10) =52874a(11) =178648a(12) =823085a(13) =2903549a(14) =13436779a(15) =48720169a(16) =228260341a(17) =849198384a(18) =3991541312a(19) =15120095518a(20) =71589010237a(21) =275869985842
External references
- oeis: A148660