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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 3 |
| 5 | 6 |
| 6 | 17 |
| 7 | 28 |
| 8 | 62 |
| 9 | 107 |
| 10 | 201 |
| 11 | 316 |
| 12 | 607 |
| 13 | 909 |
| 14 | 1567 |
| 15 | 2444 |
| 16 | 4025 |
| 17 | 5979 |
| 18 | 9749 |
| 19 | 14250 |
| 20 | 22467 |
| 21 | 32950 |
| 22 | 50137 |
| 23 | 72295 |
| 24 | 109728 |
| 25 | 156182 |
| 26 | 230570 |
| 27 | 328089 |
| 28 | 477606 |
| 29 | 670213 |
| 30 | 968324 |
| 31 | 1346662 |
| 32 | 1917385 |
| 33 | 2658120 |
| 34 | 3736326 |
| 35 | 5139004 |
| 36 | 7183707 |
| 37 | 9798418 |
| 38 | 13546453 |
| 39 | 18414693 |
[0,0,0,1,3,6,17,28,62,107,201,316,607,909,1567, 2444,4025,5979,9749,14250,22467,32950,50137,72295, 109728,156182,230570,328089,477606,670213,968324, 1346662,1917385,2658120,3736326,5139004,7183707, 9798418,13546453,18414693] |