A270959 Number of set partitions of [n] having exactly five pairs (m,m+1) such that m+1 is in some block b and m is in block b+1.

4, 127, 1856, 20074, 191967, 1753407, 15845905, 144101608, 1329935983, 12512797900, 120312183453, 1183814298898, 11928314725101, 123117825217659, 1301722909447207, 14096302961791594, 156301760858165116, 1773962132569829592, 20600385809700410195

Offset: 9

Author

Alois P. Heinz, Mar 26 2016

Keywords

• nonn

Examples

			a(9) = 4: 1369|258|47, 136|259|48|7, 139|258|47|6, 159|248|37|6.
		

Links

• Alois P. Heinz, Table of n, a(n) for n = 9..220
• Wikipedia, Partition of a set

Crossrefs

Column k=5 of A270953.