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), (-1, 1, 1), (1, 0, 0)}.
A148053
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), (-1, 1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =10a(5) =20a(6) =68a(7) =147a(8) =502a(9) =1140a(10) =4144a(11) =9922a(12) =36386a(13) =89466a(14) =328014a(15) =821631a(16) =3085210a(17) =7905952a(18) =29799808a(19) =77378450a(20) =291573466a(21) =764676082a(22) =2917759330a(23) =7750067028a(24) =29633931858a(25) =79340993790a(26) =303289413308a(27) =817097085372
External references
- oeis: A148053