A249514 Values of a in A216515.

0, 8, 48, 720, 43968, 910810592, 11237392872, 373293007784992, 2163097181518680, 25456855919300952, 11435623194218822640, 869331647875436971195778433312, 28252119676370239260178565366349744, 1204809438495318797522597458986895824, 53363286980501252895913793418543990281912

Offset

1,2

Links

Table of n, a(n) for n=1..15.

Formula

a(n)^2 + 7*A249518(n)^2 = 2^A216515(n)-1.

Crossrefs

Cf. A216515, A249518.

Sequence in context: A220802 A052575 A108214 * A279739 A181276 A010568

Adjacent sequences: A249511 A249512 A249513 * A249515 A249516 A249517

Keyword

nonn

Author

Zak Seidov, Oct 31 2014

Status

approved