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, 1), (1, 0, 1), (1, 1, -1)}.
A150148
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, 1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =74a(5) =268a(6) =1030a(7) =3906a(8) =15198a(9) =58918a(10) =231154a(11) =905668a(12) =3573882a(13) =14088310a(14) =55797584a(15) =220846346a(16) =876736760a(17) =3479658980a(18) =13836948432a(19) =55020160932a(20) =219061193918a(21) =872210242498
External references
- oeis: A150148