%I M3958 N1633 #20 Feb 01 2022 01:07:58
%S 1,5,30,115,425,1396,4440,13470,40000,116140,332827,942435,2647450,
%T 7386925,20511620,56731383,156451985,430462915,1182341890,3243215495,
%U 8887664047,24338341165,66616422775,182276901760,498657609720,1364083988834
%N Number of alkyls C_{n+15} H_{2n+10} (Phenan) with n carbon atoms.
%D N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H G. Polya, <a href="http://dx.doi.org/10.1524/zkri.1936.93.1.415">Algebraische Berechnung der Anzahl der Isomeren einiger organischer Verbindungen</a>, Zeit. f. Kristall., 93 (1936), 415-443; line 16 of Table I.
%H G. Polya, <a href="/A000598/a000598_3.pdf">Algebraische Berechnung der Anzahl der Isomeren einiger organischer Verbindungen</a>, Zeit. f. Kristall., 93 (1936), 415-443; Table I, line 16. (Annotated scanned copy)
%F G.f.: A(x) = (r(x)^10+r(x^2)^5)/2, r(x) = A000598(x).
%Y Cf. A000648.
%K nonn,easy
%O 0,2
%A _N. J. A. Sloane_