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A342589
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T(n,k) is the number of posets of n labeled elements with k covering relations (n>=1, k>=0). Triangle read by rows.
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2
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1, 1, 2, 1, 6, 12, 1, 12, 60, 128, 18, 1, 20, 180, 880, 2090, 960, 100, 1, 30, 420, 3480, 17550, 47772, 43920, 15000, 1710, 140, 1, 42, 840, 10360, 84630, 452004, 1428868, 2094960, 1465170, 491540, 90594, 10080, 770
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OFFSET
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1,3
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LINKS
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EXAMPLE
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The triangle starts
1: 1
2: 1 2
3: 1 6 12
4: 1 12 60 128 18
5: 1 20 180 880 2090 960 100
6: 1 30 420 3480 17550 47772 43920 15000 1710 140
7: 1 42 840 10360 84630 452004 1428868 2094960 1465170 491540 90594 10080 770
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CROSSREFS
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KEYWORD
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nonn,tabf
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AUTHOR
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STATUS
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approved
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