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), (-1, 0, 1), (1, 1, 0)}.
A148523
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), (-1, 0, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =5a(4) =19a(5) =39a(6) =145a(7) =321a(8) =1255a(9) =2963a(10) =11461a(11) =27917a(12) =110259a(13) =277159a(14) =1087913a(15) =2782553a(16) =11042671a(17) =28776715a(18) =113756413a(19) =299773221a(20) =1192805707a(21) =3182466959a(22) =12629930193a(23) =33962881873a(24) =135354541927a(25) =367196191059
External references
- oeis: A148523