1,3

Mobius transform of A000984

a(4) = 18 = (0, -1, 0, 1) dot (1, 2, 6, 20), where A000984 = (1, 2, 6, 20, 70, 252,...), and (0, -1, 0, 1) = row 4 of triangle A054525.

Cf. A000984, A054525.

Adjacent sequences: A134761 A134762 A134763 this_sequence A134765 A134766 A134767

Sequence in context: A147535 A051944 A109438 this_sequence A145780 A034551 A052926

nonn

Gary W. Adamson (qntmpkt(AT)yahoo.com), Nov 09 2007