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, 0, 1), (1, 1, -1)}.
A148960
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, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =31a(5) =100a(6) =375a(7) =1377a(8) =5342a(9) =20385a(10) =81729a(11) =324695a(12) =1327214a(13) =5392983a(14) =22420498a(15) =92871577a(16) =391003924a(17) =1642607275a(18) =6989242210a(19) =29703203101a(20) =127498712366a(21) =546985579534
External references
- oeis: A148960