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), (-1, 1, -1), (0, 0, -1), (1, -1, -1), (1, 1, 1)}.
A149509
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), (-1, 1, -1), (0, 0, -1), (1, -1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =11a(4) =47a(5) =155a(6) =579a(7) =2233a(8) =8593a(9) =33469a(10) =135037a(11) =537525a(12) =2178673a(13) =8924945a(14) =36519777a(15) =150647219a(16) =626290259a(17) =2602163219a(18) =10874068199a(19) =45661251703a(20) =191802674707a(21) =808778179043
External references
- oeis: A149509