61785domain: NAppears in sequencesCoefficients of a generalized Jaco-Lucas polynomial (even indices) read by rows.at n=47A122076Number of 4-cycles in the Lucas cube Lambda(n).at n=18A245961Expansion of Sum_{k>=0} x^(k*(k+1)/2) / Product_{j=1..k} (1 + j*x^j).at n=34A306704a(n) = n! * Sum_{k=0..n} k^(3 * (n-k)) / (n-k)!.at n=5A358687