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, 1), (-1, 1, 0), (0, -1, 1), (1, 0, 0), (1, 1, -1)}.
A148738
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, 1), (-1, 1, 0), (0, -1, 1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =25a(5) =84a(6) =323a(7) =1263a(8) =5170a(9) =21691a(10) =93163a(11) =407255a(12) =1807711a(13) =8124917a(14) =36903800a(15) =169163090a(16) =781396520a(17) =3633981175a(18) =16999571547a(19) =79933706284a(20) =377570306382
External references
- oeis: A148738