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, 0, -1), (-1, 1, 1), (0, 1, 1), (1, -1, -1)}.
A148261
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, 0, -1), (-1, 1, 1), (0, 1, 1), (1, -1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =14a(5) =33a(6) =111a(7) =323a(8) =1130a(9) =3510a(10) =12490a(11) =42029a(12) =149629a(13) =528322a(14) =1906203a(15) =6946269a(16) =25366147a(17) =94487341a(18) =350079297a(19) =1321045674a(20) =4970250084a(21) =18923592237a(22) =72192070451a(23) =276836591075
External references
- oeis: A148261