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), (0, 0, 1), (1, 0, -1), (1, 1, 1)}.
A150726
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), (0, 0, 1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =28a(4) =122a(5) =496a(6) =2256a(7) =9801a(8) =45747a(9) =206259a(10) =976950a(11) =4504593a(12) =21541669a(13) =100830298a(14) =485452210a(15) =2297097380a(16) =11115666088a(17) =53025784640a(18) =257592489664
External references
- oeis: A150726