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, 0, -1), (1, 0, 0)}.
A148255
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, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =13a(5) =41a(6) =126a(7) =386a(8) =1282a(9) =4502a(10) =16151a(11) =56767a(12) =201214a(13) =734143a(14) =2738799a(15) =10290635a(16) =38566515a(17) =145080476a(18) =553166680a(19) =2132018387a(20) =8254599276a(21) =32002694489a(22) =124412570541a(23) =486757109597
External references
- oeis: A148255