A056921 a(0) = 0, a(1) = 1, a(2*n) = n*a(2*n-1) + a(2*n-2), a(2*n+1) = a(2*n) + a(2*n-1).

0, 1, 1, 2, 5, 7, 26, 33, 158, 191, 1113, 1304, 8937, 10241, 80624, 90865, 807544, 898409, 8893225, 9791634, 106809565, 116601199, 1389422754, 1506023953, 19461710190, 20967734143, 292042254049, 313009988192, 4674182088737

Offset: 0

Author

Aleksandar Petojevic, Sep 05 2000

Keywords

• frac
• easy
• nonn

Links

• Seiichi Manyama, Table of n, a(n) for n = 0..897

Crossrefs

Cf. A058797.

Formula

Numerators of continued fraction for alternating factorial.

Extensions

More terms from James Sellers, Sep 07 2000