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A092822 Row sums of A092821. 1
1, 3, 10, 32, 100, 312, 988, 3208, 10728, 36944, 130604, 471880, 1734616, 6461808, 24317080, 92222288, 351854032, 1348762016, 5189792716, 20031335240, 77516440696, 300630949424, 1168151092552, 4546596321392, 17721978842800 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..24.

FORMULA

Superseeker suggested (1-x+ 2 I x^2/Sqrt[ -1+ 4 x])/(1-2 x)^2, first 32 terms agreeing.

MATHEMATICA

Table[Sum[(# Conjugate[ # ]&)@ Sum[Binomial[n, t] I^t, {t, 0, k}], {k, 0, n}], {n, 0, 32}] or also CoefficientList[Series[(1-x+2I x^2/Sqrt[ -1+4x])/(1-2x)^2, {x, 0, 32}], x]

CROSSREFS

Cf. A092821.

Sequence in context: A244762 A053581 A247595 * A017935 A134377 A278133

Adjacent sequences:  A092819 A092820 A092821 * A092823 A092824 A092825

KEYWORD

easy,nonn

AUTHOR

Wouter Meeussen, Mar 06 2004

STATUS

approved

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Last modified October 20 12:47 EDT 2019. Contains 328257 sequences. (Running on oeis4.)