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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 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

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.)

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: A124959 A081281 A108198 * A121289 A211561 A134248

Adjacent sequences:  A320997 A320998 A320999 * A321001 A321002 A321003

KEYWORD

nonn,tabl

AUTHOR

N. J. A. Sloane, Oct 26 2018

EXTENSIONS

More terms from Ilya Gutkovskiy, Oct 29 2018

STATUS

approved

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Last modified January 26 10:48 EST 2021. Contains 340438 sequences. (Running on oeis4.)