A301318 a(n) = sqrt(A299921(n)).

0, 1, 2, 3, 4, 11, 18, 23, 64, 105, 134, 373, 612, 781, 2174, 3567, 4552, 12671, 20790, 26531, 73852, 121173, 154634, 430441, 706248, 901273, 2508794, 4116315, 5253004, 14622323, 23991642, 30616751, 85225144, 139833537, 178447502, 496728541, 815009580, 1040068261, 2895146102, 4750223943, 6061962064, 16874148071, 27686334078, 35331704123

Offset

1,3

Links

Joerg Arndt, Table of n, a(n) for n = 1..1000

Formula

G.f.: x * (1 + 2*x + 3*x^2 - 2*x^3 - x^4) / (1 - 6*x^3 + x^6).

Prog

(PARI) concat( [0], Vec((1 + 2*x + 3*x^2 - 2*x^3 - x^4) / (1 - 6*x^3 + x^6) + O(x^66)))

Crossrefs

Cf. A299921.

Sequence in context: A328883 A192613 A002098 * A297180 A162969 A104109

Adjacent sequences: A301315 A301316 A301317 * A301319 A301320 A301321

Keyword

nonn,easy

Author

Joerg Arndt, Mar 18 2018

Status

approved