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, 1), (0, -1, 1), (1, 1, -1), (1, 1, 0)}.
A149397
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, 1), (0, -1, 1), (1, 1, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =50a(5) =195a(6) =827a(7) =3585a(8) =15764a(9) =71022a(10) =322598a(11) =1482669a(12) =6877055a(13) =32084238a(14) =150742341a(15) =711466035a(16) =3372971269a(17) =16054465033a(18) =76651185239a(19) =367106936232
External references
- oeis: A149397