149982

Appears in sequences

• Number of permutations of length n which avoid the patterns 321, 1342, 1423.at n=21A116730
• Number of 6-cycles in the n-polygon diagonal intersection graph.at n=39A300554
• Triangle, read by rows, each row n being defined by g.f. Product_{k=1..n} (k + x + 2*k*x^2), for n >= 0.at n=43A322891