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, 0), (-1, 0, 0), (0, 0, 1), (1, -1, -1), (1, 1, 0)}.
A150139
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, 0), (-1, 0, 0), (0, 0, 1), (1, -1, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =73a(5) =276a(6) =1090a(7) =4416a(8) =18242a(9) =76675a(10) =326150a(11) =1403464a(12) =6091537a(13) =26654395a(14) =117412325a(15) =520268068a(16) =2317636972a(17) =10371361869a(18) =46608781873a(19) =210226515573a(20) =951461046417
External references
- oeis: A150139