116179domain: NAppears in sequencesa(n) = Sum_{k=0..m} (k+1) * A026009(n, m-k) where m = floor(n/2)+1.at n=16A027292Binomial transform of (1,0,1,0,1,0,1,0,2,0,2,0,2,....).at n=17A084638Number of permutations of length n which avoid the patterns 1432, 2314, 2413.at n=10A116736