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, 0, 0), (0, -1, 0), (0, 0, 1), (0, 1, 0), (1, 1, -1)}.
A150140
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, 0, 0), (0, -1, 0), (0, 0, 1), (0, 1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =73a(5) =280a(6) =1119a(7) =4596a(8) =19322a(9) =82650a(10) =358876a(11) =1576911a(12) =7001693a(13) =31358107a(14) =141524444a(15) =642918451a(16) =2937880585a(17) =13493909464a(18) =62267058197a(19) =288513529181
External references
- oeis: A150140