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, -1), (0, -1, 0), (0, 1, 1), (1, 0, -1)}.
A148773
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, -1), (0, -1, 0), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =22a(5) =80a(6) =265a(7) =872a(8) =3320a(9) =12105a(10) =43408a(11) =171113a(12) =652773a(13) =2457700a(14) =9936359a(15) =39053173a(16) =151708678a(17) =624013118a(18) =2505730939a(19) =9953885478a(20) =41474123101a(21) =169199138629a(22) =683499828381
External references
- oeis: A148773