A262194 Number of compositions of n such that the maximal distance between two identical parts equals two.

0, 0, 0, 1, 1, 4, 6, 13, 23, 42, 68, 119, 197, 324, 530, 823, 1305, 2040, 3162, 4869, 7431, 11076, 16680, 24831, 36785, 54210, 79546, 115967, 167359, 241726, 347184, 496235, 707681, 1004534, 1421178, 2003969, 2806921, 3929770, 5479406, 7617149, 10562169

Offset: 0

Author

Alois P. Heinz, Sep 14 2015

Keywords

• nonn

Examples

			a(3) = 1: 111.
a(4) = 1: 121.
a(5) = 4: 131, 212, 1112, 2111.
a(6) = 6: 141, 222, 1113, 1212, 2121, 3111.
a(7) = 13: 151, 232, 313, 1114, 1213, 1222, 1312, 2131, 2221, 3121, 4111, 11122, 22111.
a(8) = 23: 161, 242, 323, 1115, 1214, 1232, 1313, 1412, 2123, 2141, 2321, 3131, 3212, 4121, 5111, 11123, 11132, 11222, 21113, 22211, 23111, 31112, 32111.
		

Crossrefs

Column k=2 of A262191.