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A182780 Twice A024537. 3
2, 4, 8, 18, 42, 100, 240, 578, 1394, 3364, 8120, 19602, 47322, 114244, 275808, 665858, 1607522, 3880900, 9369320, 22619538, 54608394, 131836324, 318281040, 768398402, 1855077842, 4478554084, 10812186008, 26102926098, 63018038202, 152139002500, 367296043200, 886731088898, 2140758220994, 5168247530884 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

REFERENCES

J. V. Leyendekkers and A. G. Shannon, Pellian sequence relationships among pi, e, sqrt(2), Notes on Number Theory and Discrete Mathematics, Vol. 18, 2012, No. 2, 58-62; http://www.nntdm.net/papers/nntdm-18/NNTDM-18-2-58-62.pdf. See Table 2.

LINKS

Table of n, a(n) for n=0..33.

CROSSREFS

Cf. A024537.

Sequence in context: A151381 A057151 A026699 * A078678 A261492 A027056

Adjacent sequences:  A182777 A182778 A182779 * A182781 A182782 A182783

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Dec 23 2012

STATUS

approved

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Last modified August 18 18:13 EDT 2017. Contains 290732 sequences.