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), (0, 0, 1), (0, 1, 0), (1, 1, 0), (1, 1, 1)}.
A151251
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), (0, 0, 1), (0, 1, 0), (1, 1, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =4a(2) =18a(3) =84a(4) =400a(5) =1928a(6) =9368a(7) =45776a(8) =224608a(9) =1105536a(10) =5454784a(11) =26966272a(12) =133518464a(13) =661936512a(14) =3285120384a(15) =16318182656a(16) =81118238208a(17) =403499984896
External references
- oeis: A151251