A250224Number of length n+1 0..3 arrays with the sum of the cubes of adjacent differences multiplied by some arrangement of +-1 equal to zero.
4, 20, 52, 208, 704, 2720, 10952, 45888, 195516, 852260, 3760588, 16656832, 73584076, 323148964, 1409241264, 6099051768, …
The first 2 terms appear at position 701.
14159265358979323846264338…
…853710507922796892589235420199561121290219608640344…
…43370423182545606838670242052339330580317306477885933…
…48728701029304328889778442052208461754193642696600261374…
| terms | string | first position | occurrences |
|---|---|---|---|
| 1 | 4 | 2 | 100,011,958 |
| 2 | 420 | 701 | 999,938 |
| 3 | 42052 | 214,950 | 10,074 |
| 4 | 42052208 | 108,503,670 | 8 |
| 5 | 42052208704 | not within 1,000,000,000 | 0 |
Searched the first 1,000,000,000 digits. Strings longer than 12 digits are not indexed.