A167891 A000004 preceded by 1, 4, 2.

1, 4, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0

Offset

0,2

Comments

Inverse binomial transform of A028387.

Links

Table of n, a(n) for n=0..104.

Formula

a(0) = 1, a(1) = 4, a(2) = 2, a(n) = 0 for n > 2.

G.f.: 1+4*x+2*x^2.

Prog

(PARI) {concat([1, 4, 2], vector(100))}

Crossrefs

Cf. A000004 (zero sequence), A028387 (n+(n+1)^2), A166926 (1, 2, 4, 0, 0, 0, 0, ...), A130706 (1, 2, 0, 0, 0, 0, ...), A130779 (1, 1, 2, 0, 0, 0, 0, ...), A167858 (3, 14, 36, 36, 12, 0, 0, 0, ...), A167876 (1, 3, 4, 2, 0, 0, 0, ...).

Sequence in context: A164804 A036115 A056582 * A105087 A238012 A324802

Adjacent sequences: A167888 A167889 A167890 * A167892 A167893 A167894

Keyword

easy,nonn

Author

Klaus Brockhaus, Nov 14 2009

Status

approved