Number of positive walks with n steps {-3,-2,-1,0,1,2,3} starting at the origin, ending at altitude 1, and staying strictly above the x-axis.
A276902
Number of positive walks with n steps {-3,-2,-1,0,1,2,3} starting at the origin, ending at altitude 1, and staying strictly above the x-axis.
Terms
- a(0) =0a(1) =1a(2) =3a(3) =12a(4) =56a(5) =284a(6) =1526a(7) =8530a(8) =49106a(9) =289149a(10) =1733347a(11) =10542987a(12) =64904203a(13) =403632551a(14) =2531971729a(15) =16002136283a(16) =101795589297a(17) =651286316903
External references
- oeis: A276902