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, 0, -1), (1, 1, 1)}.
A149581
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, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =53a(5) =201a(6) =773a(7) =2931a(8) =11729a(9) =46807a(10) =187335a(11) =762821a(12) =3124945a(13) =12808863a(14) =52974987a(15) =220149043a(16) =916268057a(17) =3831280947a(18) =16081745835a(19) =67615084323a(20) =285092046863
External references
- oeis: A149581