A182252 a(0)=4, a(n) = (a(n-1) OR n) * n.

4, 5, 14, 45, 180, 905, 5466, 38297, 306376, 2757393, 27574030, 303314341, 3639772188, 47317038457, 662438538482, 9936578077425, 158985249238800, 2702749237059617, 48649486267073430, 924340239074395189, 18486804781487903780

Offset

0,1

Links

Table of n, a(n) for n=0..20.

Formula

a(0)=4, a(n)=(a(n-1) OR n) * n, where OR is the bitwise logical inclusive-OR operator

Prog

(Python)
a=4
for i in range(1, 51):
. print a,
. a |= i
. a *= i

Crossrefs

Sequence in context: A041375 A042279 A352683 * A041857 A041034 A281911

Adjacent sequences: A182249 A182250 A182251 * A182253 A182254 A182255

Keyword

base,nonn

Author

Alex Ratushnyak, Apr 20 2012

Status

approved