A172050 A008585+A029907.

0, 4, 8, 13, 20, 30, 46, 72, 116, 191, 320, 542, 924, 1580, 2704, 4625, 7900, 13470, 22922, 38928, 65980, 111619, 188488, 317758, 534840, 898900, 1508696, 2528917, 4233956, 7080606, 11828710, 19741272, 32916164, 54835655, 91276304

Offset: 0

Author

Mats Granvik, Jan 24 2010

Keywords

• nonn

Crossrefs

Cf. A008585, A029907, (1-((-1)^a(n+4)))/2 = A172051.