1,1
Sequence is 4 + 6 + 8 + 10 + 12 + 14 + ... + n.
P. De Geest, Palindromic Sums
Cf. A028553, A028554.
Sequence in context: A020644 A027286 A119044 this_sequence A073373 A057414 A165910
Adjacent sequences: A058848 A058849 A058850 this_sequence A058852 A058853 A058854
nonn,base
Patrick De Geest (pdg(AT)worldofnumbers.com), Dec 15 2000.
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