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, 0), (0, 1, -1), (0, 1, 1), (1, 0, 1)}.
A150548
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, 0), (0, 1, -1), (0, 1, 1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =26a(4) =105a(5) =431a(6) =1827a(7) =7883a(8) =34355a(9) =151327a(10) =672562a(11) =3005578a(12) =13506779a(13) =60999340a(14) =276513218a(15) =1257747158a(16) =5739244040a(17) =26258189734a(18) =120423829974a(19) =553516970829
External references
- oeis: A150548