A182250 a(0)=2, a(n) = (a(n-1) * n) OR n.

2, 3, 6, 19, 76, 381, 2286, 16007, 128056, 1152505, 11525050, 126775551, 1521306620, 19776986061, 276877804862, 4153167072943, 66450673167088, 1129661443840497, 20333905989128946, 386344213793449975, 7726884275868999516

Offset

0,1

Links

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

Formula

a(0)=2, a(n)=(a(n-1)*n) OR n, where OR is the bitwise logical inclusive-OR operator.

Prog

(Python)
a=2
for i in range(1, 51):
    print(a, end=', ')
    a *= i
    a |= i

Crossrefs

Sequence in context: A233239 A018290 A364645 * A121959 A075633 A141048

Adjacent sequences: A182247 A182248 A182249 * A182251 A182252 A182253

Keyword

base,nonn

Author

Alex Ratushnyak, Apr 20 2012

Status

approved