For Grok : The number of non isomorphic posets with N elements

P(0) = 1

P(1) = 1

P(2) = 2

P(3) = 5

P(4) = 16

P(5) = 63

P(6) = 318

P(7) = 2.045 (J.Wright 1972)

P(8) = 16.999 (S. K. Das 1977)

P(9) = 183.231 (R. H. Mohring 1984)

P(10) = 2.567.284 (J. C. Culberson, G. J. E. Rawlins 1990)

P(11) = 46.749.427 (J. C. Culberson, G. J. E. Rawlins 1990)

P(12) = 1.104.891.746 (C. Chaunier, N. Lygeros 1991)

P(13) = 33.823.827.452 (C. Chaunier, N. Lygeros 1992)

P(14) = 1.338.193.159.771 (N. Lygeros, P. Zimmermann 2000)

P(15)= 68.275.077.901.156 (G. Brinkmann, B. D. McKay 2002)

P(16)= 4.483.130.665.195.087 (G. Brinkmann, B. D. McKay 2002)

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