1,2

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

F. N. David, M. G. Kendall and D. E. Barton, Symmetric Function and Allied Tables, Cambridge, 1966, p. 228.

G.f.: x / [(1-24x)(1-30x)(1-40x)(1-60x)(1-120x) ].

(1/24) [24^n - 4*30^n + 6*40^n - 4*60^n + 120^n ].

Equals 2^(n-1) * A103878(n).

Right-hand column 4 in triangle A008969.

Cf. a(n)=A112492(n+3, 5).

Sequence in context: A028534 A165677 A143076 this_sequence A023681 A070272 A066127

Adjacent sequences: A001239 A001240 A001241 this_sequence A001243 A001244 A001245

nonn

N. J. A. Sloane (njas(AT)research.att.com).

Formulae and more terms from Ralf Stephan, Feb 20 2005