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, 0), (0, -1, 1), (0, 1, 1), (1, 0, -1)}.
A148932
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, 0), (0, -1, 1), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =28a(5) =97a(6) =349a(7) =1302a(8) =4948a(9) =19260a(10) =76305a(11) =306502a(12) =1244827a(13) =5110421a(14) =21175303a(15) =88391007a(16) =371584013a(17) =1571765178a(18) =6684742369a(19) =28573868325a(20) =122690873139a(21) =528944280447
External references
- oeis: A148932