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), (-1, 0, 0), (0, 1, 1), (1, 0, -1), (1, 1, -1)}.
A148962
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), (-1, 0, 0), (0, 1, 1), (1, 0, -1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =31a(5) =104a(6) =408a(7) =1538a(8) =6182a(9) =25115a(10) =103931a(11) =437171a(12) =1864886a(13) =8022421a(14) =34945084a(15) =153198618a(16) =677357108a(17) =3014195229a(18) =13492139272a(19) =60729638632a(20) =274671462594
External references
- oeis: A148962