OFFSET
0,3
COMMENTS
For n > 2, a(n) is the n-th term of the weigh transform of n-gonal pyramidal numbers.
LINKS
FORMULA
a(n) ~ c * d^n / sqrt(n), where d = 4.761510955746025663058811... and c = 0.2241869836397882024713... - Vaclav Kotesovec, Aug 19 2018
MATHEMATICA
Table[SeriesCoefficient[Exp[Sum[(-1)^(k + 1) x^k (1 + (n - 3) x^k)/(k (1 - x^k)^4), {k, 1, n}]], {x, 0, n}], {n, 0, 25}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Aug 18 2018
STATUS
approved