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, 0), (1, -1, 0), (1, -1, 1), (1, 1, 0)}.
A149540
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, 0), (1, -1, 0), (1, -1, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =13a(4) =53a(5) =181a(6) =725a(7) =2697a(8) =10941a(9) =42517a(10) =174389a(11) =695889a(12) =2881173a(13) =11700657a(14) =48814821a(15) =200768841a(16) =842776029a(17) =3499647877a(18) =14765342669a(19) =61776415577a(20) =261750354349
External references
- oeis: A149540