A254403 a(n) = floor(b(n)), where b(n) = b(n-1)^(3/2), b(1) = 4.

4, 8, 22, 107, 1116, 37315, 7208411, 19353494040, 2692396855225368, 139703926313910081688758, 52217120356716278672533411477879775, 11932168478692303941858114447713697732545410824169841

Offset

1,1

Links

Table of n, a(n) for n=1..12.

Formula

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

Mathematica

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

Crossrefs

Cf. A254404.

Sequence in context: A003684 A338310 A254404 * A075688 A272563 A272152

Adjacent sequences: A254400 A254401 A254402 * A254404 A254405 A254406

Keyword

nonn,easy

Author

Vaclav Kotesovec, Jan 30 2015

Status

approved