A339711 a(n) = A178901(n)/n.

2, 2, 2, 3, 4, 6, 10, 17, 30, 54, 98, 179, 330, 612, 1142, 2141, 4030, 7612, 14422, 27401, 52192, 99639, 190613, 365341, 701454, 1348950, 2597977, 5010384, 9675224, 18705433, 36204063, 70145372, 136039509, 264076693, 513063289, 997623061, 1941320551, 3780466336

Offset

1,1

Links

Table of n, a(n) for n=1..38.

Example

a(4) = A178901(4)/4 = 12/4 = 3.

Prog

(PARI) lista(nn) = {my(va = vector(nn)); va[1] = 2;  for (n=2, nn, va[n] = (2*(n-1)*va[n-1]\n); ); va; } \\ Michel Marcus, Dec 18 2020

Crossrefs

Cf. A178901.

Sequence in context: A098523 A350514 A308620 * A048185 A368520 A095094

Adjacent sequences: A339708 A339709 A339710 * A339712 A339713 A339714

Keyword

nonn

Author

J. Lowell, Dec 16 2020

Status

approved