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, 1, -1), (0, 1, 0), (1, 0, 1)}.
A150020
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, 1, -1), (0, 1, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =18a(4) =67a(5) =242a(6) =977a(7) =4046a(8) =16328a(9) =69645a(10) =300988a(11) =1277990a(12) =5613890a(13) =24861140a(14) =108667372a(15) =486175793a(16) =2187282271a(17) =9740962302a(18) =44128325356a(19) =200720461844a(20) =905597752795
External references
- oeis: A150020