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A321000
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Array of generalized Bell numbers, read by antidiagonals upwards.
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0
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1, 1, 2, 1, 4, 5, 1, 6, 23, 15, 1, 8, 53, 173, 52, 1, 10, 95, 619, 1602, 203, 1, 12, 149, 1497, 8972, 17575, 877, 1, 14, 215, 2951, 29362, 155067, 222497, 4140, 1, 16, 293, 5125, 72852, 688439, 3109269, 3188806, 21147, 1, 18, 383, 8163, 152402, 2152651, 18766393, 70893872, 50988405, 115975
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OFFSET
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1,3
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LINKS
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Table of n, a(n) for n=1..55.
Robert Gill, The number of elements in a generalized partition semilattice, Discrete mathematics 186.1-3 (1998): 125-134. See Example 2. (Example 1, read by antidiagonals downwards, is A257565.)
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EXAMPLE
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The first few antidiagonals are:
1,
1,2,
1,4,5,
1,6,23,15,
1,8,53,173,52,
1,10,95,619,1602,203,
...
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CROSSREFS
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The first three rows are A000110, A075729, A109092.
Cf. A257565.
Sequence in context: A124959 A081281 A108198 * A121289 A211561 A134248
Adjacent sequences: A320997 A320998 A320999 * A321001 A321002 A321003
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KEYWORD
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nonn,tabl
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AUTHOR
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N. J. A. Sloane, Oct 26 2018
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EXTENSIONS
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More terms from Ilya Gutkovskiy, Oct 29 2018
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STATUS
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approved
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