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, 0, 1), (0, 0, 1), (0, 1, -1), (1, -1, 0)}.
A148097
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, 0, 1), (0, 0, 1), (0, 1, -1), (1, -1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =10a(5) =26a(6) =72a(7) =210a(8) =633a(9) =1965a(10) =6255a(11) =20320a(12) =67115a(13) =225180a(14) =765236a(15) =2629300a(16) =9128886a(17) =31973878a(18) =112868208a(19) =401357573a(20) =1436347656a(21) =5170091107a(22) =18710588629a(23) =68041269378a(24) =248527107385a(25) =911543126026
External references
- oeis: A148097