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A249514
Values of a in A216515.
1
0, 8, 48, 720, 43968, 910810592, 11237392872, 373293007784992, 2163097181518680, 25456855919300952, 11435623194218822640, 869331647875436971195778433312, 28252119676370239260178565366349744, 1204809438495318797522597458986895824, 53363286980501252895913793418543990281912
OFFSET
1,2
FORMULA
a(n)^2 + 7*A249518(n)^2 = 2^A216515(n)-1.
CROSSREFS
Sequence in context: A220802 A052575 A108214 * A279739 A181276 A010568
KEYWORD
nonn
AUTHOR
Zak Seidov, Oct 31 2014
STATUS
approved