20639456domain: NAppears in sequencesNumber of nX6 0..1 arrays with every element equal to 0, 2 or 3 horizontally or vertically adjacent elements, with upper left element zero.at n=9A301606Expansion of e.g.f. (1/x) * Series_Reversion( x/(1 - x*log(1-x))^2 ).at n=8A377390