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, 1, 0), (0, 0, 1), (1, 0, -1), (1, 1, -1)}.
A148786
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, 1, 0), (0, 0, 1), (1, 0, -1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =24a(5) =79a(6) =277a(7) =973a(8) =3608a(9) =13763a(10) =52434a(11) =206021a(12) =823010a(13) =3282418a(14) =13350760a(15) =54934079a(16) =225590067a(17) =939423614a(18) =3945522784a(19) =16537919855a(20) =70055121216a(21) =298712178611
External references
- oeis: A148786