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, 1, 0), (1, 1, -1), (1, 1, 1)}.
A150131
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, 1, 0), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =72a(5) =266a(6) =1002a(7) =3818a(8) =14682a(9) =56842a(10) =221258a(11) =864912a(12) =3392612a(13) =13344546a(14) =52609778a(15) =207803248a(16) =822105276a(17) =3256747326a(18) =12916209958a(19) =51275417840a(20) =203726521164a(21) =810030219870
External references
- oeis: A150131