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, 0, 0), (0, -1, 1), (0, 1, -1), (1, 0, 1)}.
A148815
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, 0, 0), (0, -1, 1), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =26a(5) =89a(6) =301a(7) =1113a(8) =4103a(9) =15713a(10) =61009a(11) =239022a(12) =957052a(13) =3842957a(14) =15682418a(15) =64327986a(16) =266060448a(17) =1109178457a(18) =4642255214a(19) =19584021301a(20) =82870650100a(21) =352746311724
External references
- oeis: A148815