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), (0, 1, -1), (1, 0, -1), (1, 1, -1), (1, 1, 1)}.
A149582
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), (0, 1, -1), (1, 0, -1), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =53a(5) =201a(6) =773a(7) =2963a(8) =11761a(9) =47159a(10) =189735a(11) =770225a(12) =3158973a(13) =12996675a(14) =53710019a(15) =223130215a(16) =930787997a(17) =3892415935a(18) =16331509667a(19) =68731845575a(20) =289927401743
External references
- oeis: A149582