A028380 a_n = - sum_{i=1..n-1} C(i+1, n-i) (-1)^(n-i) a_i.

0, 28, 148, 621, 2420, 9152, 34164, 126854, 470288, 1744200, 6478088, 24107105, 89908380

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