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A093660
Row sums of lower triangular matrix A093658.
2
1, 2, 2, 5, 2, 5, 5, 16, 2, 5, 5, 16, 5, 16, 16, 65, 2, 5, 5, 16, 5, 16, 16, 65, 5, 16, 16, 65, 16, 65, 65, 326, 2, 5, 5, 16, 5, 16, 16, 65, 5, 16, 16, 65, 16, 65, 65, 326, 5, 16, 16, 65, 16, 65, 65, 326, 16, 65, 65, 326, 65, 326, 326, 1957
OFFSET
1,2
COMMENTS
Records form A000522 (total number of arrangements of set of n elements). Partial sums form A093661, where A093661(2^n) = A010842(n) (incomplete Gamma Function at 2).
FORMULA
a(2^n) = A000522(n) for n>=0. a(2^n+2^m) = a(2^(m+1)) for n>m>=0.
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Apr 08 2004
STATUS
approved