330525domain: NAppears in sequencesa(n) = T(n,[ n/2 ]), where T is the array defined in A025564.at n=17A025575a(n) = Sum_{k=0..4} binomial(8,k)*binomial(n,k).at n=19A247609Number of n X 2 nonnegative integer arrays with upper left 0 and lower right n+2-6 and value increasing by 0 or 1 with every step right or down.at n=15A252924