A367723 -id:A367723 - cp's OEIS frontend

A367721 E.g.f. satisfies A(x) = exp(x*A(-x^2)).

1, 1, 1, -5, -23, 1, 601, 7771, 26545, -401183, -6965999, -42828389, 528611161, 15543020065, 141983039017, -2393449681349, -83586615493919, -708151768946879, 15447932991283105, 635290179334026427, 7146984268771158601, -162583738763505944639

Offset: 0

Seiichi Manyama, Nov 28 2023

sign

Cf. A141369, A367722, A367723.

Cf. A138292.

a_vector(n) = my(v=vector(n+1)); v[1]=1; for(i=1, n, v[i+1]=(i-1)!*sum(j=0, (i-1)\2, (-1)^j*(2*j+1)*v[j+1]*v[i-2*j]/(j!*(i-1-2*j)!))); v;

a(0) = 1; a(n) = (n-1)! * Sum_{k=0..floor((n-1)/2)} (-1)^k * (2*k+1) * a(k) * a(n-1-2*k) / (k! * (n-1-2*k)!).

A367722 E.g.f. satisfies A(x) = exp(x*A(-x^3)).

Original entry on oeis.org

1, 1, 1, 1, -23, -119, -359, 1681, 38641, 269137, 599761, -22461119, -347288039, -8704873319, -73184815703, 16491842641, 26323288948321, 725566429691041, 7867441656997921, -20568394299884543, -4768992217846599479, -108339469662214468439

Offset: 0

Seiichi Manyama, Nov 28 2023

sign

This sequence is different from A358063.

Cf. A141369, A367721, A367723.

Cf. A358063.

a_vector(n) = my(v=vector(n+1)); v[1]=1; for(i=1, n, v[i+1]=(i-1)!*sum(j=0, (i-1)\3, (-1)^j*(3*j+1)*v[j+1]*v[i-3*j]/(j!*(i-1-3*j)!))); v;

a(0) = 1; a(n) = (n-1)! * Sum_{k=0..floor((n-1)/3)} (-1)^k * (3*k+1) * a(k) * a(n-1-3*k) / (k! * (n-1-3*k)!).

cp's OEIS Frontend

A367721 E.g.f. satisfies A(x) = exp(x*A(-x^2)).

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