A254404 a(n) = floor(a(n-1)^(3/2)), a(1) = 4.

4, 8, 22, 103, 1045, 33781, 6208815, 15470810960, 1924285995519778, 84412046357073810845036, 24524866000840265443624861229739287, 3840696279681724751490160062668766360564070043725605, 238020820035391513516910494940635409432084649486247633125762760898691133120625

Offset

1,1

Links

Table of n, a(n) for n=1..13.

Formula

a(n) ~ c^((3/2)^n), where c = 2.4979223179189793375148967824709800001224474904593996103376... .

Mathematica

RecurrenceTable[{a[1]==4, a[n]==Floor[a[n-1]^(3/2)]}, a, {n, 1, 15}]

Crossrefs

Cf. A254403.

Sequence in context: A170938 A003684 A338310 * A254403 A075688 A272563

Adjacent sequences: A254401 A254402 A254403 * A254405 A254406 A254407

Keyword

nonn,easy

Author

Vaclav Kotesovec, Jan 30 2015

Status

approved