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, 0, 0), (0, 1, -1), (0, 1, 1), (1, 0, -1)}.
A148697
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, 0, 0), (0, 1, -1), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =23a(5) =68a(6) =238a(7) =808a(8) =2938a(9) =10648a(10) =40124a(11) =151756a(12) =588055a(13) =2291058a(14) =9060331a(15) =36091349a(16) =145241654a(17) =588352708a(18) =2401710933a(19) =9859511586a(20) =40725262278a(21) =169064929135a(22) =705330976327
External references
- oeis: A148697