Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 4500 articles have referenced us, often saying "we would not have discovered this result without the OEIS".
1,2
Row sums form A022811 (number of terms in n-th derivative of a function composed with itself 3 times). - Paul D. Hanna, Jul 13 2004
Table of n, a(n) for n=1..78.
1; 2,1; 3,2,1; 5,5,2,1; ...
Cf. A038498, A039800-A039809. a(n, 1) = A000041(n) (first column) (partition numbers).
Cf. A022811.
Sequence in context: A211980 A171730 A131243 * A091355 A131245 A179927
Adjacent sequences: A038494 A038495 A038496 * A038498 A038499 A038500
nonn,tabl
Christian G. Bower, Feb 15 1999.
approved