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), (1, -1, 0), (1, 0, 1), (1, 1, -1)}.
A148855
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), (1, -1, 0), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =28a(5) =91a(6) =357a(7) =1316a(8) =5290a(9) =21137a(10) =87905a(11) =364034a(12) =1561508a(13) =6634870a(14) =29020984a(15) =126046450a(16) =559099248a(17) =2469187687a(18) =11084955557a(19) =49574819823a(20) =224824650873
External references
- oeis: A148855