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, -1, 1), (-1, 0, 0), (0, 1, 1), (1, 0, -1)}.
A148440
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, -1, 1), (-1, 0, 0), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =16a(5) =45a(6) =154a(7) =499a(8) =1634a(9) =5888a(10) =20672a(11) =73593a(12) =274009a(13) =1005519a(14) =3759072a(15) =14335509a(16) =54252692a(17) =208982781a(18) =811404178a(19) =3144286752a(20) =12352600466a(21) =48645794723a(22) =191989283484a(23) =764771646799
External references
- oeis: A148440