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0, 2, 24, 350, 4896, 68962, 970200, 13652158, 192099456, 2703046850, 38034749784, 535189557278, 7530688519200, 105964828904482, 1491038292992664, 20980500931258750, 295218051329511936, 4154033219547089282, 58451683124982331800, 822477596969315258078
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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FORMULA
| a(n) is asymptotic to (1/8)*(7+2*sqrt(5))^n; a(n)=2*A052208(n)
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PROG
| (PARI) a(n)=if(n<0, 0, contfracpnqn(vector(n, i, 1+(i>1)))[2, 1]*contfracpnqn(vector (2*n, i, 1+(i>1)))[2, 1])
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CROSSREFS
| Cf. A000129.
Sequence in context: A099045 A181174 A081065 * A134805 A119702 A126804
Adjacent sequences: A043696 A043697 A043698 * A043700 A043701 A043702
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KEYWORD
| nonn
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AUTHOR
| Gary W. Adamson, Feb 01 2000
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