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, 0, 0), (0, 1, 1), (1, -1, -1), (1, 0, -1)}.
A148809
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, 0, 0), (0, 1, 1), (1, -1, -1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =26a(5) =86a(6) =300a(7) =1099a(8) =4065a(9) =15464a(10) =60126a(11) =235711a(12) =938916a(13) =3786566a(14) =15373560a(15) =63058702a(16) =260700178a(17) =1083632350a(18) =4536791630a(19) =19096536008a(20) =80737061523a(21) =343192967447
External references
- oeis: A148809