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, -1, 1), (0, 0, -1), (0, 1, 0), (1, 0, 1)}.
A150002
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, -1, 1), (0, 0, -1), (0, 1, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =17a(4) =60a(5) =216a(6) =814a(7) =3207a(8) =12825a(9) =51562a(10) =212425a(11) =886744a(12) =3711524a(13) =15720371a(14) =67150582a(15) =288177213a(16) =1244820633a(17) =5402409852a(18) =23563033358a(19) =103220279392a(20) =453516014870
External references
- oeis: A150002