A303673 -id:A303673 - cp's OEIS frontend

A303671 a(n) = [x^n] (6 / Sum_{k=0..n} (k+3)!*x^k)^(1/2).

1, -2, -4, -20, -140, -1192, -11656, -127072, -1517480, -19624400, -272656064, -4046157472, -63844717184, -1067307017600, -18846094327360, -350578477836160, -6854465726916640, -140564170444594880, -3017526392523529600, -67690323794750627200

Offset: 0

Seiichi Manyama, Apr 28 2018

sign

Seiichi Manyama, Table of n, a(n) for n = 0..446

Cf. A077607, A303672, A303673.

[seq(coeff(series((factorial(3)/add(factorial(k+3)*x^k,k=0..n))^(1/2), x,30),x,n),n=0..25)]; # Muniru A Asiru, Apr 29 2018

N=66; x='x+O('x^N); Vec((3!/sum(k=0, N, (k+3)!*x^k))^(1/2))

A303672 a(n) = [x^n] (5040 / Sum_{k=0..n} (k+7)!*x^k)^(1/4).

Original entry on oeis.org

1, -2, -8, -60, -600, -7152, -96456, -1430544, -22933920, -393013280, -7144207808, -137001926144, -2760226854816, -58242464679360, -1283886660610560, -29506641823939200, -705788634473952000, -17544801385483584000, -452659831142363014400

Offset: 0

Seiichi Manyama, Apr 28 2018

sign

Seiichi Manyama, Table of n, a(n) for n = 0..444

Cf. A077607, A303671, A303673.

[seq(coeff(series((factorial(7)/add(factorial(k+7)*x^k,k=0..n))^(1/4), x,30),x,n),n=0..25)]; # Muniru A Asiru, Apr 29 2018

N=66; x='x+O('x^N); Vec((7!/sum(k=0, N, (k+7)!*x^k))^(1/4))

cp's OEIS Frontend

A303671 a(n) = [x^n] (6 / Sum_{k=0..n} (k+3)!*x^k)^(1/2).

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