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, 0, -1), (1, 0, -1), (1, 1, 0)}.
A148682
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, 0, -1), (1, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =22a(5) =66a(6) =227a(7) =758a(8) =2723a(9) =9807a(10) =36535a(11) =136783a(12) =525245a(13) =2031029a(14) =7958899a(15) =31458447a(16) =125716531a(17) =505462106a(18) =2048274371a(19) =8355777974a(20) =34294187162a(21) =141446086258a(22) =586560299481
External references
- oeis: A148682