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A028380 a_n = - sum_{i=1..n-1} C(i+1, n-i) (-1)^(n-i) a_i. 0
0, 28, 148, 621, 2420, 9152, 34164, 126854, 470288, 1744200, 6478088, 24107105, 89908380 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

The values do not reflect the definition. They seem to be defined by (n-1)*(9*n+10)*(n+5) * a(n) = 2*n*(9*n+19)*(2*n+3) *a(n-1), n>1. - R. J. Mathar, Dec 15 2015

LINKS

Table of n, a(n) for n=0..12.

CROSSREFS

Sequence in context: A042532 A187608 A069917 * A219887 A271636 A188778

Adjacent sequences:  A028377 A028378 A028379 * A028381 A028382 A028383

KEYWORD

nonn,obsc

AUTHOR

Grisha Berkolaiko (grisha(AT)ORY.ph.biu.ac.il)

STATUS

approved

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Last modified June 22 00:39 EDT 2021. Contains 345367 sequences. (Running on oeis4.)