A182557 a(n) = a(n-1)*2 + floor(sqrt(a(n-2))).

0, 1, 2, 5, 11, 24, 51, 106, 219, 448, 910, 1841, 3712, 7466, 14992, 30070, 60262, 120697, 241639, 483625, 967741, 1936177, 3873337, 7748065, 15498098, 30998979, 62001894, 124009355, 248026584, 496064303, 992144354, 1984310980, 3968653458, 7937351461, 15874765919

Offset

0,3

Links

Table of n, a(n) for n=0..34.

Formula

a(0)=0, a(1)=1, a(n) = a(n-1)*2 + floor(sqrt(a(n-2))).

Prog

(Python)
import math
prpr = 0
prev = 1
for n in range(55):
.  current = prev*2 + int(math.sqrt(prpr))
.  print prpr,
.  prpr = prev
.  prev = current

Crossrefs

Cf. A076677, A076678.

Sequence in context: A300277 A294378 A090764 * A027934 A336482 A134389

Adjacent sequences: A182554 A182555 A182556 * A182558 A182559 A182560

Keyword

nonn

Author

Alex Ratushnyak, May 05 2012

Status

approved