A321000 Array of generalized Bell numbers, read by antidiagonals upwards.

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

Author

N. J. A. Sloane, Oct 26 2018

Keywords

• nonn
• tabl

Examples

			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,
...
		

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.)

Crossrefs

The first three rows are A000110, A075729, A109092.

Cf. A257565.

Extensions

More terms from Ilya Gutkovskiy, Oct 29 2018