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), (1, -1, 0), (1, 1, 0), (1, 1, 1)}.
A150715
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), (1, -1, 0), (1, 1, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =28a(4) =108a(5) =408a(6) =1600a(7) =6208a(8) =24480a(9) =96112a(10) =380736a(11) =1504448a(12) =5974432a(13) =23695968a(14) =94274816a(15) =374805568a(16) =1492974912a(17) =5944886400a(18) =23702141440a(19) =94482227200a(20) =376947250432
External references
- oeis: A150715