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, 1, -1), (1, -1, 0), (1, 1, 1)}.
A149522
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, 1, -1), (1, -1, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =11a(4) =51a(5) =147a(6) =691a(7) =2229a(8) =10705a(9) =36887a(10) =179395a(11) =646933a(12) =3162665a(13) =11791917a(14) =57803825a(15) =220956323a(16) =1085915767a(17) =4231652157a(18) =20847441081a(19) =82512710229a(20) =407267112001
External references
- oeis: A149522