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), (-1, -1, 1), (-1, 1, -1), (1, 0, 0), (1, 1, 0)}.
A150058
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), (-1, -1, 1), (-1, 1, -1), (1, 0, 0), (1, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =18a(4) =63a(5) =217a(6) =840a(7) =3116a(8) =12822a(9) =49940a(10) =213082a(11) =858065a(12) =3752144a(13) =15476710a(14) =68937433a(15) =289560421a(16) =1308381375a(17) =5574640541a(18) =25475136467a(19) =109797841012a(20) =506366381092
External references
- oeis: A150058