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, 0), (0, 1, -1), (0, 1, 1), (1, 0, -1)}.
A148698
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, 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) =40166a(11) =151882a(12) =588307a(13) =2293416a(14) =9069276a(15) =36127407a(16) =145408695a(17) =588975370a(18) =2404220639a(19) =9871235991a(20) =40771858947a(21) =169254989928a(22) =706134499243
External references
- oeis: A148698