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, -1, 1), (-1, 0, 1), (0, -1, 1), (1, 1, 0)}.
A149143
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, -1, 1), (-1, 0, 1), (0, -1, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =9a(4) =36a(5) =115a(6) =415a(7) =1533a(8) =5620a(9) =21745a(10) =81919a(11) =321111a(12) =1253400a(13) =4935875a(14) =19638310a(15) =78189715a(16) =314738408a(17) =1265989251a(18) =5129667839a(19) =20842916637a(20) =84946968208a(21) =347484625799
External references
- oeis: A149143