0,2
L. Euler, De mirabilibus proprietatibus numerorum pentagonalium, par. 29
L. Euler, On the remarkable properties of the pentagonal numbers
Equals A005449(n)^2. Cf. A100255.
Adjacent sequences: A100253 A100254 A100255 this_sequence A100257 A100258 A100259
Sequence in context: A092866 A078187 A041065 this_sequence A000596 A113525 A064751
nonn
Ralf Stephan, Nov 13 2004
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