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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