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, 0), (0, 0, 1), (1, -1, 0), (1, 1, -1)}.
A148454
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, 0), (0, 0, 1), (1, -1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =17a(5) =57a(6) =205a(7) =745a(8) =2875a(9) =11305a(10) =45332a(11) =186380a(12) =774303a(13) =3267037a(14) =13949978a(15) =60078464a(16) =261420213a(17) =1145680231a(18) =5056693164a(19) =22468775276a(20) =100367233789a(21) =450802933329
External references
- oeis: A148454