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, -1), (1, 1, 1)}.
A151191
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, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =3a(2) =12a(3) =52a(4) =235a(5) =1089a(6) =5132a(7) =24471a(8) =117690a(9) =569694a(10) =2771599a(11) =13537956a(12) =66339820a(13) =325941961a(14) =1604927091a(15) =7917089993a(16) =39115460328a(17) =193510653777a(18) =958415963991
External references
- oeis: A151191