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A051237 and A187869 are the sequence that result if in addition we require that the number begins with "1" and ends with "n".
Table of n, a(n) for n=1..10.
Claudio Meller, Lineas con numeros de 1 a n.
Cf. A051237, A187869.
Sequence in context: A132943 A262576 A262575 * A187869 A262574 A159901
Adjacent sequences: A187868 A187869 A187870 * A187872 A187873 A187874
N. J. A. Sloane, Mar 14 2011
a(6) to a(10) from Claudio Meller, Mar 14 2011
a(10) corrected by Nathaniel Johnston, Mar 15 2011