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, 1), (-1, 1, 1), (0, 1, -1), (1, 0, 0)}.
A148256
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, 1), (-1, 1, 1), (0, 1, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =13a(5) =41a(6) =126a(7) =450a(8) =1576a(9) =5558a(10) =20085a(11) =75344a(12) =284951a(13) =1072907a(14) =4158325a(15) =16293529a(16) =63554124a(17) =250829327a(18) =1002990132a(19) =4013678248a(20) =16096741510a(21) =65229130199a(22) =265531317724
External references
- oeis: A148256