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), (0, 0, 1), (0, 1, 0), (1, 0, 1)}.
A151030
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), (0, 0, 1), (0, 1, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =3a(2) =9a(3) =29a(4) =99a(5) =347a(6) =1237a(7) =4479a(8) =16413a(9) =60669a(10) =225891a(11) =846337a(12) =3187347a(13) =12056175a(14) =45776953a(15) =174394913a(16) =666330231a(17) =2552533539a(18) =9800807749a(19) =37710097167a(20) =145368599629a(21) =561339873889
External references
- oeis: A151030