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, -1, 1), (-1, 1, 0), (1, 0, 0)}.
A147999
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, -1, 1), (-1, 1, 0), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =8a(5) =15a(6) =39a(7) =77a(8) =244a(9) =543a(10) =1655a(11) =3729a(12) =12385a(13) =29510a(14) =93170a(15) =221283a(16) =764948a(17) =1908675a(18) =6323115a(19) =15688889a(20) =55069789a(21) =141067986a(22) =473165330a(23) =1200395415a(24) =4290381497a(25) =11232104990a(26) =38585190644a(27) =100082744787a(28) =360316046969a(29) =956558534943
External references
- oeis: A147999