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, -1)}.
A148048
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, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =10a(5) =20a(6) =58a(7) =139a(8) =438a(9) =1140a(10) =3258a(11) =9772a(12) =28562a(13) =85882a(14) =251866a(15) =805191a(16) =2408942a(17) =7397564a(18) =23342986a(19) =72959148a(20) =230591190a(21) =716489490a(22) =2346086618a(23) =7379407456a(24) =23549213138a(25) =76289251170a(26) =246337916414a(27) =799728360510
External references
- oeis: A148048