A137400 a(n) = A128941(n) + 2.

6, 30, 140, 631, 2786, 12136, 52368, 224406, 956516, 4060038, 17175132, 72454075, 304941386, 1280898304, 5371301504, 22491017758, 94055344244, 392888085100, 1639534704632, 6835739258998, 28477594607348, 118551827347576

Offset

0,1

Links

Table of n, a(n) for n=0..21.

Crossrefs

Cf. A128941.

Sequence in context: A092439 A082149 A002457 * A220830 A199938 A285195

Adjacent sequences: A137397 A137398 A137399 * A137401 A137402 A137403

Keyword

nonn

Author

Lyle Ramshaw (lyle.ramshaw(AT)hp.com), Apr 08 2008

Status

approved