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, 1, 1), (0, 0, -1), (0, 1, 1), (1, 0, 1)}.
A150505
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, 1, 1), (0, 0, -1), (0, 1, 1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =25a(4) =102a(5) =413a(6) =1743a(7) =7400a(8) =32160a(9) =140424a(10) =620874a(11) =2757026a(12) =12342218a(13) =55456373a(14) =250542600a(15) =1135446947a(16) =5166323175a(17) =23568637465a(18) =107844723956a(19) =494567555276
External references
- oeis: A150505