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), (0, 1, 0), (1, 1, -1), (1, 1, 1)}.
A150125
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), (0, 1, 0), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =70a(5) =250a(6) =910a(7) =3362a(8) =12562a(9) =47316a(10) =179340a(11) =683300a(12) =2615034a(13) =10045386a(14) =38709710a(15) =149568252a(16) =579264594a(17) =2248081292a(18) =8740576452a(19) =34038561714a(20) =132748629244a(21) =518386521518
External references
- oeis: A150125