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, 0), (1, 0, -1), (1, 0, 0)}.
A148022
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, 0), (1, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =8a(5) =17a(6) =48a(7) =112a(8) =347a(9) =911a(10) =2885a(11) =7886a(12) =26162a(13) =76110a(14) =255274a(15) =759672a(16) =2620889a(17) =8108113a(18) =28152858a(19) =88374823a(20) =312756148a(21) =1008227273a(22) =3582900787a(23) =11668371798a(24) =42040174135a(25) =139593853572a(26) =504390828353
External references
- oeis: A148022