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), (0, 1, -1), (0, 1, 0), (1, 0, -1), (1, 1, 0)}.
A149943
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), (0, 1, -1), (0, 1, 0), (1, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =49a(5) =172a(6) =627a(7) =2374a(8) =9218a(9) =36536a(10) =147576a(11) =604114a(12) =2505636a(13) =10503384a(14) =44429132a(15) =189530129a(16) =814217984a(17) =3520596956a(18) =15311050911a(19) =66930619301a(20) =293971727765
External references
- oeis: A149943