A057553 Rank of (1,1,...,1) (n 1's) when {0,1,2,...}^n is lexicographically ordered.

1, 5, 16, 56, 203, 749, 2795, 10517, 39832, 151658, 579956, 2225964, 8570330, 33086030, 128028650, 496432760, 1928418395, 7503144365, 29235705215, 114064338335, 445552419545, 1742264571605, 6819546853625, 26717004445325

Offset: 1

Author

Clark Kimberling, Sep 07 2000

Keywords

• nonn

Examples

			For n=3, the ordering starts (0,0,0), (0,0,1), ... and the 15th term is (1,1,1).
		

Formula

a(n)=C(2n-1, n)+b(n-2)+1, where b=A057552.