416808domain: NAppears in sequencesa(n) = [ a(n-1)/a(1) ] + [ a(n-3)/a(3) ] + [ a(n-5)/a(5) ] + ..., for n >= 3.at n=33A022860Triangle T(n,k), 0<=k<=n, defined by T(n,k) = 0 if k<0 or k>n, T(0,0) = 1, T(n,k) = T(n,k-1)+T(n-1,k-1)+T(n-1,k)+T(n-1,k+1).at n=39A122479a(0) = 1; a(n) = 6 * Sum_{k=1..n} binomial(n,k) * a(k-1).at n=6A345077