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, 1), (-1, 1, -1), (1, 0, 0)}.
A148006
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, 1), (-1, 1, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =8a(5) =15a(6) =44a(7) =91a(8) =300a(9) =675a(10) =2246a(11) =5225a(12) =18369a(13) =44590a(14) =157351a(15) =389281a(16) =1418064a(17) =3598815a(18) =13127212a(19) =33721485a(20) =125539307a(21) =327997148a(22) =1221478559a(23) =3218359939a(24) =12154464884a(25) =32412375855a(26) =122407772319a(27) =328464178536
External references
- oeis: A148006