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, 1), (-1, 0, 0), (0, 1, -1), (1, 0, 1), (1, 1, -1)}.
A149442
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, 1), (-1, 0, 0), (0, 1, -1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =13a(4) =47a(5) =181a(6) =740a(7) =3069a(8) =13058a(9) =56579a(10) =249045a(11) =1108338a(12) =4984405a(13) =22604514a(14) =103286755a(15) =474904820a(16) =2195871006a(17) =10202830924a(18) =47613446894a(19) =223056800199
External references
- oeis: A149442