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), (0, 1, 1), (1, -1, 0), (1, 0, -1)}.
A148930
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), (0, 1, 1), (1, -1, 0), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =27a(5) =101a(6) =363a(7) =1293a(8) =5243a(9) =20337a(10) =78015a(11) =328693a(12) =1331243a(13) =5327113a(14) =22958959a(15) =95597169a(16) =393249551a(17) =1720773845a(18) =7304282483a(19) =30640477305a(20) =135557193295a(21) =583622065549
External references
- oeis: A148930