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, 1), (1, 1, -1), (1, 1, 1)}.
A149436
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, 1), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =13a(4) =46a(5) =170a(6) =632a(7) =2377a(8) =9130a(9) =35114a(10) =135854a(11) =530218a(12) =2071864a(13) =8120100a(14) =31966534a(15) =125949879a(16) =497098272a(17) =1966882682a(18) =7787141436a(19) =30862959230a(20) =122506652958a(21) =486488602742
External references
- oeis: A149436