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A321000
Array of generalized Bell numbers, read by antidiagonals upwards.
0
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
OFFSET
1,3
LINKS
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.)
EXAMPLE
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,
...
CROSSREFS
The first three rows are A000110, A075729, A109092.
Cf. A257565.
Sequence in context: A081281 A108198 A371686 * A121289 A211561 A134248
KEYWORD
nonn,tabl
AUTHOR
N. J. A. Sloane, Oct 26 2018
EXTENSIONS
More terms from Ilya Gutkovskiy, Oct 29 2018
STATUS
approved