A199638 Last number in row n of triangle A199636.

5, 3, 21, 13, 85, 53, 341, 227, 1365, 909, 5461, 3637, 21845, 14563, 87381, 58253, 349525, 233013, 1398101, 932067, 5592405, 3728269, 22369621, 14913077, 89478485, 59652323, 357913941, 238609293, 1431655765, 954437173, 5726623061, 3817748707, 22906492245

Offset: 4

Author

T. D. Noe, Nov 14 2011

Keywords

• nonn

Comments

This sequence appears to satisfy a(n) = 4*a(n-2) + a(n-6) - 4*a(n-8). It also appears that a(2n) = A002450(n).