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A055419 Number of points in N^n of norm <= 4. 2
1, 5, 17, 54, 165, 482, 1319, 3390, 8262, 19250, 43154, 93601, 197381, 406200, 817954, 1614348, 3126068, 5943728, 11103912, 20396957, 36869790, 65637607, 115178814, 199377387, 340708159, 575150851, 959691775, 1583660542 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Andrew Howroyd, Table of n, a(n) for n = 0..1000

FORMULA

Empirical g.f.: (11*x^16 -164*x^15 +936*x^14 -2841*x^13 +5310*x^12 -6697*x^11 +6044*x^10 -3984*x^9 +1734*x^8 -75*x^7 -741*x^6 +827*x^5 -539*x^4 +235*x^3 -68*x^2 +12*x -1) / (x -1)^17. - Colin Barker, Jul 07 2013

CROSSREFS

Row n=4 of A302998.

Sequence in context: A195689 A079363 A034346 * A027091 A183712 A244235

Adjacent sequences:  A055416 A055417 A055418 * A055420 A055421 A055422

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified April 23 05:42 EDT 2021. Contains 343199 sequences. (Running on oeis4.)