1,2

a(n) = A000203(n) * A024916(n) = row sums of triangle A143237.

a(4) = 105 = A000203(4) * A024916(4) = 7 * 15.

a(4) = 105 = sum of row 4 terms of triangle A143237: (7, + 21, + 28 + 49).

Cf. A000203, A024916, A143237.

Sequence in context: A134582 A081268 A068381 this_sequence A102080 A102091 A045669

Adjacent sequences: A143235 A143236 A143237 this_sequence A143239 A143240 A143241

nonn

Gary W. Adamson (qntmpkt(AT)yahoo.com), Aug 01 2008