A248574 a(n) = A027306(n) + A027306(n-1) for n > 0; a(0) = 1.

1, 2, 4, 7, 15, 27, 58, 106, 227, 419, 894, 1662, 3534, 6606, 14004, 26292, 55587, 104739, 220918, 417526, 878810, 1665242, 3498444, 6644172, 13934990, 26517902, 55531948, 105863596, 221384892, 422711484, 882865128, 1688171496, 3521765667, 6742991139

Offset

0,2

Comments

Central terms of triangle in A249111.

Links

Reinhard Zumkeller, Table of n, a(n) for n = 0..1000

Prog

(Haskell)
a248574 0 = 1
a248574 n = a027306 (n - 1) + a027306 n

Crossrefs

Cf. A027306, A249111.

Sequence in context: A259592 A291220 A299099 * A136336 A244456 A232394

Adjacent sequences: A248571 A248572 A248573 * A248575 A248576 A248577

Keyword

nonn

Author

Reinhard Zumkeller, Nov 14 2014

Status

approved